Acterna SPM-32A Operating Manual
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Acterna SPM-32A Operating Manual

Selective level meters
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SPM-32A ... SPM-36A
Selective Level Meters
Operating Manual

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Summary of Contents for Acterna SPM-32A

  • Page 1 SPM-32A ... SPM-36A Selective Level Meters Operating Manual...
  • Page 3 SPM-32A ... SPM-36A Selective Level Meters Operating Manual SPM-32A, BN 4033/11: 50 Hz to 620 kHz, Series O ... SPM-33A, BN 4033/01: 50 Hz to 2 MHz, Series O ... SPM-34A, BN 4033/20: 50 Hz to 2 MHz, Series O ...
  • Page 4 © Copyright 2002 Acterna, LLC. All rights reserved. Acterna, The Keepers of Communications, and its logo are trademarks of Acterna, LLC. All other trademarks and registered trade- marks are the property of their respective owners.

  • Page 5: Table Of Contents

    Contents FOREWORD......1-1 About these instruments ..1-1 About this handbook .
  • Page 6 4.1.2 Display ..... . 4-11 Operation and features ..4-15 4.2.1 Operating modes ....4-15 4.2.1.1 Selective level measurements .
  • Page 7 4.2.6.2 Display averaging (AVRG) ..4-58 4.2.6.3 MAX.HOLD ....4-59 4.2.7 Storing setups (MEMORY) ..4-60 4.2.7.1 Addresses.
  • Page 8 Selectivity, bandwidth selectable . . 5-12 Harmonic ratio ak2, ak3 ..5-14 Demodulator ....5-14 Memory ..... 5-14 General specifications .

  • Page 9: Foreword

    Bild 1-0 Tabelle About these instruments The SPM-32A, 33A, 36A series of Selective Level Meters are designed as in-service test sets for CF communications systems using up to 120, 300 or 600 channels respectively. The SPM-34A Selective Level Meter is particularly suitable...
  • Page 10 1.1 About these instruments SPM-32A ... SPM-36A When combined with the PS-33A Level Generator (2 MHz), each of the instruments forms a complete test setup for measuring level , gain and attenuation. The built-in synthesizer and 1 Hz frequency resolution allow accurate, stable frequency settings across the entire range.

  • Page 11: About This Handbook

    SPM-32A ... SPM-36A 1.2 About this handbook About this handbook Textual conventions All instruments in the SPM-33 family are described in this handbook. Where the instruments differ, this is indicated by an appropriate fotnote or by the instrument name in the subheading.
  • Page 12 1.2 About this handbook SPM-32A ... SPM-36A Example: in this figure "BATTERY?" is written in bold script as this aspect of the instrument is being discussed.

  • Page 13: Safety Information

    SPM-32A ... SPM-36A 2 Safety information Safety information Bild 2-0 Tabelle Before connecting up The instruments left the factory in perfect condition. To ensure correct and safe operation, please read the following information before using the equipment. Correct usage The instruments may only be used under the conditions and for the purposes for which they are intended.
  • Page 14 2 Safety information SPM-32A ... SPM-36A Safety information: LNT-2 AC Adapter/Charger Unit AC line voltage Before use, make sure that the operating voltage of the LNT-2 and the local AC power supply voltage are the same. Fuse The excess-temperature fuse built into the device does not depend on the a.c.
  • Page 15 SPM-32A ... SPM-36A 2 Safety information Spare parts Only original spare parts should be used. Spare parts from other sources may be used only if their use does not adversely affect the safety of the LNT-2. Temperature The LNT-2 is intended for use indoors and can be operated at temperatures between 0 and + 50 °C.
  • Page 16 2 Safety information SPM-32A ... SPM-36A Notes:...

  • Page 17: General Information For The User

    SPM-32A ... SPM-36A 3.1 Display contrast GENERAL INFORMATION Bild 3-0 FOR THE USER Tabelle Display contrast Similar to modern pocket calculators, these instruments have an LCD display. The display contrast depends on: – the light incident on the display – the viewing angle Fig.

  • Page 18: Power Supplies

    3.2 Power supplies SPM-32A ... SPM-36A You will find the contrast control in the hole in the lefthand side of the set. You can adjust the control with a thin screwdriver. Set the contrast so that – the lettering is clear and –...

  • Page 19: Battery Power

    8 hours, or – Rechargeable NiMH batteries (same size as 6LF22); these give an operating time of about 2 hours. Acterna supply suitable rechargeable batteries, see accessories (Specifications). Fig. 3-2 Terminals of 9 V rechargeable battery with charger contact...
  • Page 20 3.2 Power supplies SPM-32A ... SPM-36A Low batteries If the batteries are low, – "BATTERY?" is displayed, and – the instrument is switched off automatically after a few minutes. The built-in lithium battery ensures that the memory contents are retained.
  • Page 21 SPM-32A ... SPM-36A 3.2 Power supplies Changing the batteries Warning: Do not charges the batteries or NiMH cells with the instrument switched on. The memory contents can be lost if you do this. The batteries are changed in the following way: •...
  • Page 22 3.2 Power supplies SPM-32A ... SPM-36A • Replace the new batteries as shown in the diagram below. The flat cable must be below the batteries and must not be twisted. Fig. 3-4 How to replace the batteries in the battery compartment.
  • Page 23 SPM-32A ... SPM-36A 3.2 Power supplies Charging the batteries When the AC adapter is connected, the rechargeable batteries are trickle-charged. If the warning "BATTERY?" is displayed, it is necessary to charge the batteries. • Connect the AC adapter • Set the instrument to PERM ON mode (no auto-off) ON/OFF PERM.ON...
  • Page 24 3.2 Power supplies SPM-32A ... SPM-36A If the AC line voltage is too low, the warning "LINE POWER?" is displayed. This warning disappears within 1 minute when the correct AC line voltage is applied. Fig. 3-5 Instrument set to charge mode, but AC line voltage missing.

  • Page 25: Important Note For All Instruments

    Batteries purchased from Acterna can be returned to your nearest Acterna service center. Removing the lithium battery before scrapping the...

  • Page 26: Switching On The Instrument

    3.3 Switching on the instrument SPM-32A ... SPM-36A Switching on the instrument ON/OFF This key is used to switch the instrument on or off. When the instrument is switched on a self-test is run which checks the microprocessor. The test lasts about 6 seconds. The...
  • Page 27 SPM-32A ... SPM-36A 3.3 Switching on the instrument When operated from dry or rechargeable batteries, the instrument switches off automatically after 15 minutes if no key is pressed to save power. This function can be disabled by pressing: ON/OFF PERM.ON The instrument will now remain on permanently.
  • Page 28 In such cases, contact your local Acterna Service center for assistance. When “Default setting” and “Setups cleared” have been displayed, the instrument will be set to its default settings (see (see section 3.4 on page 3-13).

  • Page 29: Default Settings (Reset)

    SPM-32A ... SPM-36A 3.4 Default settings (reset) Default settings (reset) The instrument can be set to the default settings at any time by pressing ON/OFF CLEAR simultaneously to perform a “hardware reset”. The message “Default setting” appears during the self-test and the stored instrument settings are retained.

  • Page 30: Electromagnetic Compatibility

    3.5 Electromagnetic compatibility SPM-32A ... SPM-36A Electromagnetic compatibility This instrument meets the requirements of EN 50081-1 and is within Limit Class B of EN 55022 (identical with CISPR 22:1985 and DIN VDE 0878 Part 3). The instrument has been tested to ensure that the EMI/RFI emission requirements are also met when it is used as part of a system.

  • Page 31: Operation

    SPM-32A ... SPM-36A 4.1 Overview OPERATION Bild 4-0 Tabelle Overview 4.1.1 Connectors and keys Explanation of symbols used: "X" ..Description of the function selected when [X] is pressed. "Y" ... Description of function Y which is selected when the key sequence [*] (shift) [X] is entered.
  • Page 32 4.1 Overview SPM-32A ... SPM-36A Shift key (yellow) • When a key sequence having the form [*][X] is entered, the function in yellow lettering below [X] is selected. • When the shift key is pressed, a star flashes in the top line of the display.
  • Page 33 SPM-32A ... SPM-36A 4.1 Overview FREQ To enter a new frequency press [TUNE] TUNE then: • Enter the frequency using the number keys (entry taken as kHz) and terminate with [ENTER] • The frequency can be entered in steps using the four up / down keys (coarse, fine);...
  • Page 34 4.1 Overview SPM-32A ... SPM-36A To enter a new frequency or to alter the STEP frequency press [STEP] then: • Enter the frequency using the number keys (entry taken as kHz), terminate with [ENTER]. • The frequency can be incremented or decremented by means of the 4 up / down keys, the stepwidth is ∆F.
  • Page 35 SPM-32A ... SPM-36A 4.1 Overview MODE Displays the absolute level in dB or dBm. Toggle between dB and dBm "dB/dBm" by entering the key sequence [*], [-]. "REF", using this key sequence you can alter the reference level (-120 dB to +20 dB): •...
  • Page 36 4.1 Overview SPM-32A ... SPM-36A • "REL" can be incremented or decremented using the up / down keys. Demodulates single sideband signals. DEMOD You can toggle between LSB and USB demodulation by pressing this key. The built-in loudspeaker can be used to listen to the demodulated signal.
  • Page 37 SPM-32A ... SPM-36A 4.1 Overview BANDW/Hz Bandwidth setting shown for SPM-34A as example; the bandwidths implemented in each device or option are listed in sections 5.5 and 4.2.4 Broadband measurement over entire WIDE frequency range. Selective measurement at 25 Hz bandwidth.
  • Page 38 4.1 Overview SPM-32A ... SPM-36A Z/Ω The input impedance, Z, = 75 Ω The input impedance, Z, = 150 Ω (or 120, 124, 135 or 140 Ω depending on the version) The input impedance, Z, = 600 Ω INPUT Toggles between the selected input Z/∞...
  • Page 39 SPM-32A ... SPM-36A 4.1 Overview Using the up / down keys, you can increase or decrease the frequency, the level, the loudspeaker volume or the address number in steps. If you hold any of the keys down, the repeat function is activated.
  • Page 40 4.1 Overview SPM-32A ... SPM-36A • After the key sequence [*], [dBm0] (="REL(dBr)") has been entered, the stored reference level can be incremented or decremented by 1 dBr or 0.1 dB. • [DEMOD]: increases or decreases the volume in steps of 6 dB (or 2dB) •...

  • Page 41: Display

    SPM-32A ... SPM-36A 4.1 Overview 4.1.2 Display The instrument's display is divided into 4 rows and 16 columns. Various device parameters are marked around the edge of the display; squares in the display indicate which parameters have been selected. In this manual, the rows will be designated by the letters A to D and the columns with the numbers 1 to 16.
  • Page 42 4.1 Overview SPM-32A ... SPM-36A Meaning of symbols * (flashes) (A2), the yellow shift key has been pressed. Clear with [CLEAR]. ---> The value indicated by the arrow may be altered. The arrow flashes when an entry has been started but not terminated.
  • Page 43 SPM-32A ... SPM-36A 4.1 Overview C3), [SEARCH] and then [ ↓ ] have been pressed; starts the search, the frequency is decreasing. BATTERY? (D), the battery voltage is too low (see section 3.2.2 on page 3-3) BATT.? POWER? (D), the errors indicated by "BATTERY?"...
  • Page 44 4.1 Overview SPM-32A ... SPM-36A (D14.), appears after [*] and [↑] have been entered; "STO" and an address are displayed alternately. By pressing [ENTER] you can store the current setup and result at the address shown in the display. WIDEBAND (C), appears when [WIDE] is pressed.

  • Page 45: Operation And Features

    SPM-32A ... SPM-36A 4.2 Operation and features Operation and features 4.2.1 Operating modes The instrument has 3 operating modes: • Selective level measurements (indicated by "meas." in table 4-1) • Demodulating SSB signals; monitored using the built-in loudspeaker (indicated by "monitor" in table 4-1).

  • Page 46: Selective Level Measurements

    4.2 Operation and features SPM-32A ... SPM-36A 4.2.1.1 Selective level measurements To set the instrument for selective measurements: • Select input and input impedance: Use the key in the group marked "Z/Ω" and the shift key: [*] [1], [*] [2] or [*] [3] --->...
  • Page 47 SPM-32A ... SPM-36A 4.2 Operation and features • If necessary, select the expanded bargraph and the averaging facility. Use the keys in the group marked "SCALE" and the shift key: [*] [7] or [*] [8] ---> (see section 4.2.6 on page 4-56)

  • Page 48: Wideband Measurements

    4.2 Operation and features SPM-32A ... SPM-36A 4.2.1.2 Wideband measurements To set the instrument to measure levels with the wideband receiver: • Select the input and the input impedance: Use the keys in the group marked "Z/Ω" and the shift key: [*] [1], [*] [2] or [*] [3] --->...
  • Page 49 SPM-32A ... SPM-36A 4.2 Operation and features Row A: Level (input open-circuit) Row B: Bargraph Row C: "WIDEBAND" Row D: Relative level, reference level or memory function (or blank) • The mean value is measured. The result shown is, however, the rms value of a sinusoidal signal with the same frequency.

  • Page 50: Ssb Demodulation (Demod)

    4.2 Operation and features SPM-32A ... SPM-36A 4.2.1.3 SSB demodulation (DEMOD) The instrument can demodulate SSB signals. The signals can be monitored but cannot be measured. Telephone channels in the CF range are demodulated to the AF range (0.3 to 3.4 kHz), provided the instrument is tuned to the centre of the channel Fig.
  • Page 51 SPM-32A ... SPM-36A 4.2 Operation and features tuned to give correct reception. The correct offsets are given below: LOWER SB -2 kHz UPPER SB +2 kHz • Select the sideband: By pressing [DEMOD] you can toggle between the LSB and USB (display "UPPER SB", "LOWER SB").

  • Page 52: Inputs, Input Impedances (Z/W)

    4.2 Operation and features SPM-32A ... SPM-36A 4.2.2 Inputs, input impedances (Z/ Ω Note: The instrument has various input impedance options; the 150 Ω input impedance can be replaced by impedances of 120, 124, or 140 Ω. The following deals with the 150 Ω version of the instrument, but applies in principle to the other versions.
  • Page 53 SPM-32A ... SPM-36A 4.2 Operation and features – 75 Ω: coaxial input – 150 or 600 Ω: balanced input (BAL). Example: input impedance of 600 Ω/balanced input: A small square next to the lettering on the right-hand edge of the display shows which input impedance has been selected.
  • Page 54 4.2 Operation and features SPM-32A ... SPM-36A The following key is use to select the input impedance (75, 150, 600 Ω or "∞") Z/∞ When this key is pressed the ohmic part of the input impedance is disconnected from the input connector leaving only the high impedance of the input amplifier (>...
  • Page 55 SPM-32A ... SPM-36A 4.2 Operation and features Voltage levels and power levels Voltage levels (dB) are referred to a voltage of 0.775 V (1 mW into 600 Ω). For this reason, the level does not change when measurements are made using a generator with an output impedance of 0 Ω...

  • Page 56: Receive Frequency (Freq)

    4.2 Operation and features SPM-32A ... SPM-36A 4.2.3 Receive frequency (FREQ) The three keys in the group marked "FREQ" are used to select the receive frequency of the selective receiver manually or automatically. TUNE SEARCH STEP ∆F TUNE The receive frequency can be entered using the number keys or in steps (coarse/fine) using the up/down keys.

  • Page 57: Frequency Entry

    SPM-32A ... SPM-36A 4.2 Operation and features 4.2.3.1 Frequency entry (TUNE: keypad or steps) The selective receiver is selected by pressing: TUNE The receive frequency can be set in the following ways: – Numerical entry using the number keys – In steps using the up / down keys Fig.
  • Page 58 4.2 Operation and features SPM-32A ... SPM-36A Changing the frequency using the up / down keys SPM-32A/-33A/-34A/-36A: Frequency is incremented by 10, 100 or 200 Hz (depends on bandwidth) Frequency is increased by 1 Hz Frequency is decreased by 1 Hz...

  • Page 59: Frequency Entry (Step: Keypad, Adjustable Step Width)

    SPM-32A ... SPM-36A 4.2 Operation and features If you hold the keys down, the frequency will change in steps automatically. With the single arrow keys, the step size is then 10 Hz instead of 1 Hz. 4.2.3.2 Frequency entry (STEP: keypad,...
  • Page 60 4.2 Operation and features SPM-32A ... SPM-36A Numerical frequency entry Example: 1.2345 MHz: ENTER Always enter the frequency in kHz. Frequency steps By pressing the frequency is increased by ∆F By pressing the frequency is decreased by ∆F The previously stored value will be used unless altered.

  • Page 61: Search

    SPM-32A ... SPM-36A 4.2 Operation and features Fig. 4-8 Typical display before the entry of a new step width (∆F). For new entry press [*] [STEP] ∆F can now be changed – using the up / down keys in steps of 1 Hz or 10 Hz, or –...
  • Page 62 4.2 Operation and features SPM-32A ... SPM-36A The AFC function ensures that the instrument remains tuned to the first signal it encounters. If no signal is found the search will end at one or other of the frequency limits. Unless the wideband level of a signal (measured with...
  • Page 63 SPM-32A ... SPM-36A 4.2 Operation and features Even when measuring voltages, the threshold is entered in “dB” or “dBm”, depending on which unit was selected prior to switching over to voltage measurement. The input value, converted to a voltage, is displayed in line A also.
  • Page 64 4.2 Operation and features SPM-32A ... SPM-36A Activate SEARCH • Select SEARCH: SEARCH • Start SEARCH: Frequency will increase Frequency will decrease The direction of the search is indicated by an arrow in front of the current frequency in the display. The search direction can be reversed during a search if required.
  • Page 65 SPM-32A ... SPM-36A 4.2 Operation and features Further information • AFC is activated automatically. • The uncertainty in the comparison of the signal level and the THRESHOLD value is + 1 dB Signal will be found Signal level - always...
  • Page 66 4.2 Operation and features SPM-32A ... SPM-36A • The search speed depends on the filter bandwidth and on whether the display averaging function has been acti- vated ([AVRG] key). Bandwidth [AVRG] 5 Hz 8 Hz/s 50 Hz/s 25 Hz 40 Hz/s...

  • Page 67: Afc

    SPM-32A ... SPM-36A 4.2 Operation and features 4.2.3.4 The AFC function adjusts the receive frequency to the input frequency. AFC only comes into operation when selective measurements are being made and will only function properly if there is a discrete signal of sufficient amplitude in the passband of the selected filter.
  • Page 68 4.2 Operation and features SPM-32A ... SPM-36A Switching on AFC TUNE • Tune the receiver so that the frequency of the signal is within the bandwidth of the filter • The square beside "AFC" stops flashing when the AFC locks onto a frequency and the receiver is tuned to the signal frequency •...

  • Page 69: Bandwidths

    4.2.4 Bandwidths From 3 to 6 different bandwidths are provided, depending on the instrument type. The following section explains the uses and setting of the various bandwidths. Band- SPM-32A SPM-33A SPM-34A SPM-35A SPM-36A width × 5 Hz × × ×...
  • Page 70 4.2 Operation and features SPM-32A ... SPM-36A 5 Hz bandwidth The analog radio signals used to indicate the zone and to signal broadcast announcements in the ARI system (used on highways in Germany and other countries) lie very close to the 57 kHz auxiliary carrier.
  • Page 71 SPM-32A ... SPM-36A 4.2 Operation and features 1200, 400, 200, 100 Hz bandwidths These bandwidths are useful for measuring the rms level in a FM VFT channel to ITU-T specifications. The level meter should be tuned to the center frequency of the VFT channel under investigation.
  • Page 72 4.2 Operation and features SPM-32A ... SPM-36A 1.74 kHz bandwidth This filter corresponds to the 3.1 kHz channel filter, but has a smaller effective noise bandwidth. It is intended for measuring weighted noise. Its noise bandwidth is the same as that of the weighting filter specified by the ITU-T-O.41 (see figure 4-15, page 4-42).

  • Page 73: Setting The Bandwidth

    SPM-32A ... SPM-36A 4.2 Operation and features 4.2.4.1 Setting the bandwidth SPM-32A/-33A/-36A: Note: A 100 Hz filter option for the instrument can be used to replace the 25 Hz filter (option BN 4033/00.52). The following on the 25 Hz filter applies in principle to the 100 Hz filter.
  • Page 74 4.2 Operation and features SPM-32A ... SPM-36A SPM-34A/-35A: Note: A 300 Hz filter can be supplied as an option instead of the 400 Hz filter for the SPM-34A. Indication of filter selected: A number is shown in the lower left-hand corner of the display.
  • Page 75 SPM-32A ... SPM-36A 4.2 Operation and features Example: Setting the 3.1 kHz bandwidth WIDE 3,1 k Keys [5] and [6] are assigned two filter values each. This means that to set certain values the [*] and number keys may need to be pressed twice in succession.

  • Page 76: Level Mode

    4.2 Operation and features SPM-32A ... SPM-36A Example: Setting the 25 Hz filter bandwidth 4.2.5 Level mode The results are displayed in terms of an absolute level or a level difference. Levels express the ratio of two quantities. One quantity may be a reference, i.e.

  • Page 77: Absolute Level (Abs)

    SPM-32A ... SPM-36A 4.2 Operation and features The following can be entered: – reference level (REF) – relative level (REL) Designation Result Constants Units Absolute level dB/dBm Level difference ABS-REF Reference level dB/dBm dBm0/dB0 dBm0 dB0/dBm0 (ABS-REL) 1, 2 Relative level...
  • Page 78 4.2 Operation and features SPM-32A ... SPM-36A If a generator with an output impedance of 0 Ω is used for the measurement, the level result does not change when the input impedance of the instrument is altered. Absolute power level (dBm) is the log of a ratio of a power to a reference power (1 mW).
  • Page 79 SPM-32A ... SPM-36A 4.2 Operation and features Voltage measurement Absolute measurements can be displayed in terms of power level or voltage. Display range 1 µV to 3.8 V Selective measurement Wideband Measurement 1 mV to 3.8 V Switching from power level to voltage display...

  • Page 80: Level Difference (Abs-Ref)

    4.2 Operation and features SPM-32A ... SPM-36A 4.2.5.2 Level difference (ABS-REF), reference level (REF) The level difference (ABS-REF) is the difference between the measured absolute level and a reference level (REF). The reference level can be entered as a constant. It is also possible to store a result and use it as the reference level.
  • Page 81 SPM-32A ... SPM-36A 4.2 Operation and features Fig. 4-19 Typical level difference display (ABS-REF); selective measurement mode has been selected. The reference level is shown in row D of the display. The reference level can be entered after pressing the key sequence [*] [ABS].
  • Page 82 4.2 Operation and features SPM-32A ... SPM-36A Entering the reference level as a constant You can change the reference level after you have entered the following key sequence: The current value of the reference level is shown in row D of the display.
  • Page 83 SPM-32A ... SPM-36A 4.2 Operation and features Using a measured level as a reference level A result is stored as a reference level by entering the following key sequence: ABS- → "!" is displayed in the lower left-hand corner of the display as an acknowledgment.

  • Page 84: Levels In Dbm0, Relative Levels

    4.2 Operation and features SPM-32A ... SPM-36A • Measure the level difference ABS-REF 4.2.5.3 Levels in dBm0, relative levels (REL) Level in dBm0 = Absolute level - Level in dBr. Fig. 4-20 Level plan for a transmission system At the 0 TLP (0 dBr point) the level in dBm0 is equal to the absolute power level.
  • Page 85 SPM-32A ... SPM-36A 4.2 Operation and features The dBm0 mode is selected by entering: dBm0 Level in dBm0 = Abs. level (dBm) - Stored rel. level (dBr). Example Measured level -64.5 dBm (ABS) - Relative level -15.0 dBr (REL) Level in dBm0 -49.5 dBm0...

  • Page 86: Bargraph, Avrg, Max. Hold

    4.2 Operation and features SPM-32A ... SPM-36A • The relative level can also be taken to be a relative voltage level, regardless of whether the level is displayed in dB or dBm. The numerical value is not adjusted when you switch from dB to dBm or vice versa.
  • Page 87 SPM-32A ... SPM-36A 4.2 Operation and features Normal scale Scale: 10 dB (dBm) per division -120 -100 = = = = = = = = = = = = = = = = = = = = = = = =...

  • Page 88: Display Averaging (Avrg)

    4.2 Operation and features SPM-32A ... SPM-36A n*10 dB + ..-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 dB = = = = = = = = = = = = = = = =...

  • Page 89: Max.hold

    SPM-32A ... SPM-36A 4.2 Operation and features 4.2.6.3 MAX.HOLD This function displays the maximum rms signal level of a var- iable input signal detected during the measurement period. This allows you to check idle channels for intermittent inter- ference or overvoltages, as long as the signal is present for long enough for the autorange function to operate.

  • Page 90: Storing Setups (Memory)

    4.2 Operation and features SPM-32A ... SPM-36A 4.2.7 Storing setups (MEMORY) The instrument can store up to 100 complete setups which can be recalled when required. The current result is also stored when the setup is stored. As it is possible to display stored setups without using them for measurements, the memory can also be used as an electronic notebook.
  • Page 91 SPM-32A ... SPM-36A 4.2 Operation and features The [ENTER] key terminates the entry. Fig. 4-23 Typical display when RCL MEM is selected. The address (in this case 34) can now be modified. • Incrementing or decrementing the address number: Address is increased by 5...

  • Page 92: Storing A Setup (Sto)

    4.2 Operation and features SPM-32A ... SPM-36A 4.2.7.2 Storing a setup (STO) To store a setup, e.g. at address 25: ENTER STO MEM • When STO MEM has been selected by pressing [*] and then [↑], "STO" and an address number are shown in the display (they flash on and off alternately) •...
  • Page 93 SPM-32A ... SPM-36A 4.2 Operation and features Storing results When a setup is stored, the current result is also stored. These results can be viewed later using the DISPLAY MEM function. In effect, the instrument can be used as an electronic notebook, which tells you the settings you have used as well as the results.

  • Page 94: Recall Setup (Rcl)

    4.2 Operation and features SPM-32A ... SPM-36A 4.2.7.3 Recall setup (RCL) You can recall a stored setup as often as you want from memory. When you press [ENTER] the instrument is set to the recalled setup and the measurement is started immediately.
  • Page 95 SPM-32A ... SPM-36A 4.2 Operation and features Calling up several setups To recall a sequence of stored setups, you do not need to reselect the RCL MEM function each time. Example: Recall three setups; starting at address is 12. The first address is entered using the number keys.
  • Page 96 4.2 Operation and features SPM-32A ... SPM-36A Updating stored results Stored results and setups can be updated by recalling the setup and storing it at the same address after a measurement has been made. The setup itself is unchanged. The new results can be viewed later using DISPLAY MEM.

  • Page 97: Display

    SPM-32A ... SPM-36A 4.2 Operation and features 4.2.7.4 DISPLAY Stored setups can be viewed with the DISPLAY MEM function. This gives you – an overview of the memory contents – a way of reading off the results stored with the setups.

  • Page 98: Avoiding Errors Due To Large Common-Mode Voltages

    4.2 Operation and features SPM-32A ... SPM-36A 2nd setup: (address increased by 1 to 1) 3rd setup: (address increased by 1 to 2) The whole memory can be examined quickly in this way. Display mode is switched off by entering: MEM OFF The instrument is set to the last setup and starts measuring.

  • Page 99: Specifications

    Input impedance, selectable ..75 Ω, high impedance Return loss SPM-32A/-33A/-34A/-35A ....≥ 40 dB SPM-36A: 50 Hz to 2 MHz ..... ≥ 40 dB 50 Hz to 3.5 MHz .

  • Page 100: Frequency

    Frequency Frequency range SPM-32A ....50 Hz to 620 kHz SPM-33A/-34A/-35A ... 50 Hz to 2 MHz SPM-36A .
  • Page 101 SPM-32A ... SPM-36A 5.2 Frequency AFC tuning accuracy SPM-32A/-33A/-36A: at bandwidths (B) ≤100 Hz ... . . ± 1 Hz at B ≥ 1.74 kHz ....± 10 Hz SPM-34A/-35A: at B ≤...
  • Page 102 5.2 Frequency SPM-32A ... SPM-36A – Automatically using a single search (The pre-settable level is threshold) Level difference between max. signal level and response threshold: SPM-32A/-33A/-35A/-36A: at B < 100 Hz ....≤ 40 dB at B ≥...

  • Page 103: Level Measurements

    Quasi-analog bar graph as trend display Scale, selectable SPM-32A/-33A/-36A....140 dB/10 dB SPM-34A/-35A ....110 dB/10 dB...

  • Page 104: Display Range

    5.3 Level measurements SPM-32A ... SPM-36A 5.3.3 Display range From noise floor to maximum measured level SPM-32A/-33A/-36A: ≥ Input Selective, f 10 kHz Wideband Ω Coaxial, 75 < -120 to +20 dBm < -50 to + 20 dBm Balanced Ω...

  • Page 105: Error Limits Of The Level Display

    Coaxial B = 100 Hz ± ± ± ± B = 25 Hz Level range/dBm + 20 - 100 Ω (75, 135, 150 Level range/dB, dBm -100 - 110 Ω (600 Table 5-4 Intrinsic error and variation with level (SPM-32A/-33A/-36A)
  • Page 106 5.4 Error limits of the level display SPM-32A ... SPM-36A SPM-34A ± Balanced ± ± ± ± ± Coaxial Level range/dBm + 20 Ω (75, 135, 150 Level range/dB, dBm Ω (600 Table 5-5 Intrinsic error and variation with level (SPM-34A)

  • Page 107: Variation Of Level Display With Frequency

    SPM-32A ... SPM-36A 5.4 Error limits of the level display 25 Hz to 3.1 kHz bandwidths ± Balanced ± ± ± ± ± Coaxial Level range/dBm + 20 Ω (75, 135, 150 Level range/dB, dBm Ω (600 Table 5-7 Intrinsic error and variation with level, 25 Hz bis 3,1 kHz (SPM-35A) 5.4.2...

  • Page 108: Total Error

    5.4 Error limits of the level display SPM-32A ... SPM-36A 5.4.3 Total error (the total of all previously listed errors) SPM-32A/-33A/-36A: ± ± f=200 Hz to 620 kHz 0.7 dB 1.1 dB ± ± f=200 Hz to 1.62 MHz 0.9 dB 1.3 dB...
  • Page 109 SPM-32A ... SPM-36A 5.4 Error limits of the level display SPM-34A/-35A ± f=200 Hz to 620 kHz Error limits ± f=200 Hz to 1.62 MHz (selective) ± f=50 Hz to 2 MHz ± f=200 Hz to 620 kHz — Error limits ±...

  • Page 110: Selectivity, Bandwidth Selectable

    5.5 Selectivity, bandwidth selectable SPM-32A ... SPM-36A Selectivity, bandwidth selectable SPM-32A/-33A/-36A: Nominal Effective Bandwidth for Centre value noise attenuation frequency < 3 dB ±∆f for bandwidth attenuation > 60 dB 25 Hz 24 Hz ± 250 Hz 100 Hz 80 Hz ±...
  • Page 111 Image frequency and IF attenuation for input levels ≤ 0 dBm SPM-32A/-33A/-34A/-36A....> 60 dB SPM-35A: at B = 25 Hz to 3.1 kHz ....≥Š 60 dB at B = 5 Hz .

  • Page 112: Harmonic Ratio Ak2, Ak3

    ≤ SPM-32A/33A/-36A ....> 60 dB SPM-34A ..... . > 55 dB SPM-35A: at B = 25 Hz to 3.1 kHz .

  • Page 113: General Specifications

    SPM-32A ... SPM-36A 5.9 General specifications General specifications 5.9.1 Power supply Dry batteries ... Two IEC 6LF22 or 6LR61 (built-in) NiMH batteries ... . Two, e.g. Varta V7/8H (with charging contact) (or NiCd rechargeable batteries .

  • Page 114: Electromagnetic Compatibility

    5.9 General specifications SPM-32A ... SPM-36A Limits operating range ..- 10 to + 55 Limits range, transport and storage . . . - 30 to + 70 Relative air humidity (to 40 C) .

  • Page 115: 5.10 Ordering Information

    SPM-32A ... SPM-36A 5.10 Ordering information 5.10 Ordering information SPM-32A (CF connector) ... .BN 4033/11 SPM-32A ....BN 4033/12...
  • Page 116 5.10 Ordering information SPM-32A ... SPM-36A Options 124 Ω instead of 150 Ω ... BN 4033/00.60 135 Ω instead of 150 Ω ... BN 4033/00.61 140 Ω...
  • Page 117 SPM-32A ... SPM-36A 5.10 Ordering information Leather case no. 10 ....BN 0926/23 MK-1 Equipment Case ... . .BN 2090/09 Balanced test adapter for complex impedance .
  • Page 118 5.10 Ordering information SPM-32A ... SPM-36A 5-20...

  • Page 119: Index

    Index BATT.? POWER? 4-13 Battery power BATTERY? 4-13 Symbols 4-14 ! (briefly) 4-12 * (flashes) 4-12 3-10, 4-8, 4-13 4-22 Calibration 3-10 ---> 4-12 Changing the ---> D 4-12 batteries 4-12 CHARGE 4-2, 4-14 Charging the batteries Coaxial input 4-5, 4-47 ABS--->REF Absolute level 4-47...
  • Page 120 4-59 Measured ENTER Measured quantities EXPAND 4-6, 4-14 MEM OFF 4-10 MEMORY 4-60 MODE FREQ 4-3, 4-26 Frequency entry 4-27 ON/OFF 3-10, 4-2 Operating modes 4-15 General Information Operation INPUT PERM.ON 3-11, 4-2, • 4-14 4-14 4-14 POWER 4-14 Power level 4-25, 4-48 input distruction limit Power supply...
  • Page 121 4-12 up / down keys 4-12 Safety information SCALE Voltage levels 4-25 Scale 4-57 Voltage SEARCH 4-3, 4-26, 4-31 measurement Search speed 4-36 Selecting voltage level 4-48 Selective level measurements WIDEBAND 4-14 4-16 Wideband Setting the measurements bandwidth 4-43 4-18 SPECIFICATIONS SPM-TEST 3-10...

This manual is also suitable for:

Spm-36aSpm-33aSpm-34aSpm-35a

Table of Contents