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Summary of Contents for TTI 1705
- Page 1 THURLBY THANDAR INSTRUMENTS Model 1705 PROGRAMMABLE TRUE RMS MULTIMETER INSTRUCTION MANUAL Telemeter Electronic GmbH | Joseph-Gaensler-Str. 10 | Phone +49 906 70693-0 | Fax +49 906 70693-50 | www.telemeter.info...
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Page 2: Table Of Contents
Table of Contents Introduction Specifications Safety Installation General Operation Making Basic Measurements Dual Measurement Mode Advanced Features Data Logging and Printing Calibration Maintenance Remote Operation Remote Commands General Commands Main Display Commands Dual Measurement Mode Commands First Level Modifier Commands Second Level Modifier Commands Data Logging Commands Calibration Commands... -
Page 3: Introduction
Introduction This programmable true RMS multimeter has dual measurement capability and a dual display † which can show either two independent measurements, a measurement together with its range or a measurement with one of the many calculated functions available. The key features are: •... -
Page 4: Specifications
Specifications ACCURACY Accuracies apply for 1 year 19°C to 25°C. Temperature coefficient outside these limits is <0.1 x quoted range accuracy per °C. DC Volts Range Accuracy Resolution 100mV 10uV 0.06% ± 3 dig.* * after null 1000mV 0.04% ± 2 dig. 100uV 0.06% ±... - Page 5 (AC + DC) Voltage Accuracy Total measurement error will not exceed the sum of the separate ac and dc accuracy specifications plus 1 display count. Resistance Range Accuracy Resolution 0.1% ± 3 dig. 100Ω 10mΩ 0.08% ± 2 dig. 1000Ω 100mΩ...
- Page 6 Frequency Range Accuracy Resolution 100Hz 0.01Hz 1000Hz 0.01% ± 1 dig. 0.1Hz 10kHz 100kHz 10Hz Range: 10Hz to 100kHz Input sensitivity: Better than 30m Vrms (100mV range); better than 10% of range for all other Vac and Iac ranges. Capacitance Range Accuracy Resolution...
- Page 7 AC plus DC: The RMS value of the ac plus dc parts of the signal is calculated and displayed. % Deviation: Displays % deviation from entered reference value. Ax+B: Linear scaling of results, with offset. Limits: Reading displayed with HI, LO, or PASS with respect to user-defined high and low limits.
- Page 8 Cambridgeshire PE29 7DR England declare that the Model 1705 True RMS Programmable Multimeter and Model 1705GP True RMS Programmable Multimeter with GPIB meet the intent of the EMC Directive 89/336/EEC and the Low Voltage Directive 73/23/EEC. Compliance was demonstrated by conformance to the following specifications which have been listed in the Official Journal of the European Communities.
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Page 9: Safety
Safety This multimeter is a Safety Class I instrument according to IEC classification and has been designed to meet the requirements of EN61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use). It is an Installation Category II instrument intended for operation from a normal single phase supply. -
Page 10: Emc
This instrument has been designed to meet the requirements of the EMC Directive 89/336/EEC. Compliance was demonstrated by meeting the test limits of the following standards: Emissions EN61326 (1998) EMC product standard for Electrical Equipment for Measurement, Control and Laboratory Use. Test limits used were: Radiated: Class B Conducted: Class B... -
Page 11: Installation
The case halves are held together by 4 plastic push-rivets. Use the blade of a small screwdriver in the slot beside each rivet to first ease out the rivet head and then fully remove the rivet body. Separate the case halves. Visit www.tti-test.com for further details. 3) Change the transformer connections following the diagrams below: 4) Reassemble in the reverse order. - Page 12 Either rechargeable or disposable cells may be used; fit into the battery tray observing the polarity marked in the tray. Suitable cells are as follows: Rechargeable: 2 Amp hour, e.g. NCC200, AN220, VR2C, RSH1.8, P-180C. Disposable: Alkaline, e.g. MN1400. Zinc Carbon, e.g. R14B, R14S. If batteries are fitted it is essential that the disposable/rechargeable selector switch on the rear panel is positioned correctly before applying external power via the AC socket.
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Page 13: General Operation
General Operation This section is a general introduction to the features and organisation of the multimeter intended to be read before using the instrument for the first time. Detailed operation is covered in later sections, starting with Making Basic Measurements. Connections Input Sockets The input sockets are 4mm safety sockets on a 19mm pitch designed to accept 4mm safety plugs... - Page 14 The interface is fully isolated from the measurement system and the GPIB signal grounds are connected to the safety ground. The pin connections are as specified in IEEE std. 488.1-1987. The implemented subsets are: SH1, AH1, T8, L4, SR0, RL2, PP0, DC1, DT0 C0, E2 The address is selectable from the front panel.
- Page 15 Keyboard Keyboard Organisation The keys can be considered in two groups: The two rows of keys in the lower half of the keyboard directly select the functions and ranges of both the primary and secondary displays. When pressed alone the function keys select the function of the primary display, cancel any secondary function, and set autorange;...
- Page 16 The position of the decimal point and the units of the parameter being edited are determined by the range in use at the time the modifier is selected. The exception is A of Ax+b which has its decimal point position fixed after the first digit, i.e. the range for A is ±0.0001 to ±9.9999. If the meter is in autorange mode and the range in use is inappropriate (e.g.
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Page 17: Making Basic Measurements
Making Basic Measurements This section describes how basic measurements are made, i.e. single measurement mode only and no post-processing of the results. Scale Length The scale length is ±12000 for all measurements except capacitance (full scale 1200) and the 20MΩ resistance range (full scale 2400). Function Selection All functions are directly selected by pressing the appropriate function key (Vdc, Ω, Hz, etc.). - Page 18 Making Voltage Measurements Voltage measurements are made using the red V/Ω socket and the black COM socket having selected the appropriate function and range as described above. The meter will show a minus sign (on dc measurements) when the voltage applied to the red socket is more negative than that applied to the black socket.
- Page 19 Making Continuity and Diode Checks Continuity and diode checks are made using the V/Ω and COM sockets. Pressing the Continuity/Diode check key selects Continuity mode with the first press; the continuity indicator is shown in the display. The 1000Ω range is selected and readings below approximately 10Ω...
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Page 20: Dual Measurement Mode
Dual Measurement Mode In Dual Measurement Mode a completely independent but complementary measurement can be made and displayed on the secondary display. The two independent measurements are actually made alternately, not simultaneously, and the display update rate for each measurement is consequently reduced. - Page 21 Making Voltage and Current Dual Measurements Measuring ac and dc Volts, or ac Volts and frequency, etc. still only require two measurement probes because both parameters of the dual measurement are made at the same physical point. Simultaneous measurement of voltage and current on the same circuit will however require a third connection, see the diagram: Note that the voltage measured at the multimeter terminals is that across the load plus the voltage drop in the common lead which is now carrying the whole circuit current.
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Page 22: Advanced Features
Advanced Features The advanced features of this multimeter are all accessed using the keys in the top two rows of the keyboard. Broadly, they divide into First Level Modifiers which are accessed via dedicated keys (dB, Hold and Null) and Second Level Modifiers which are all accessed from a menu using the FUNCTION modifier key. - Page 23 The default reference impedance is 600Ω but a different value can be selected by entering the edit mode. With dB already selected press EDIT; the main display will now show rEF and the current impedances will be shown in the secondary display. Use the Range Up/Range Down keys to scroll through the list of impedances which can be set: 50, 75, 93, 110, 124, 125, 135, 150, 250, 300, 500, 600, 900, 1000, 1200, and 8000Ω.
- Page 24 during edit. The reference default value of 10000 (decimal point determined by range) can be entered by pressing Clr and the latest meter reading can be entered by pressing Copy rdg. Limits High and low limits can be set, against which the current reading is compared. When running, the main display shows the actual reading and the secondary display shows PASS (reading between or equal to set points), HI (reading >HI) or LO (reading <LO).
- Page 25 Watts The Watts function calculates power using the formula Watts = V It can only be run when Vdc or Vac are selected in the main display. The reference impedance can be set anywhere between 1 and 99999 Ohms. To select Watts press the FUNCTION key until the W symbol flashes in the menu of modifiers. Pressing Edit will then permit the reference impedance to be set as described earlier in the Number Editing section;...
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Page 26: Data Logging And Printing
Data Logging and Printing Data Logger The logger function can store up to 100 readings from the main display in non-volatile memory. The store is linear, without wrap-around. Readings are triggered by either the internal timer, manual key press, remote contact closure or RS232 remote command. Readings are stored as floating-point numbers with their units and reading number but without any form of time stamping. - Page 27 Printing The current display reading or the logger results can be output via the RS232 port. Connect the device to the RS232 port. Press Shift then Baud (the shifted function of Run) and use the Range Up/Range Down keys to select an appropriate Baud rate; exit Baud rate selection by pressing Baud again or Esc.
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Page 28: Calibration
Calibration General Calibration is guaranteed as in the specification. The Manufacturers provide a re-calibration service, as do most of their agents overseas. Where owners wish to carry out re-calibration themselves, this should only be done by skilled personnel with access to precision equipment working in conjunction with the service manual which may be purchased directly from the Manufacturers or their agents overseas. -
Page 29: Maintenance
Maintenance Routine maintenance is limited to re-calibration (described above), battery replacement (described in the Installation section) and cleaning. The only repair maintenance that can be carried out by the user is current range fuse replacement. Cleaning If the meter requires cleaning use a cloth that is only lightly dampened with water or a mild detergent. -
Page 30: Remote Operation
Remote Operation Introduction RS232 remote control is standard and can be used either in a conventional one-to-one mode or in addressable mode as part of an ARC (Addressable RS232 Chain) system; RS232 can only be used when the meter is powered from an AC supply. GPIB (IEEE-488) remote control is available in addition to RS232 on a mains-only version;... - Page 31 state by pressing the Local key; however, the effect of this action will remain only until the instrument is addressed again or receives another character from the ARC interface, when the remote state will once again be entered. ARC Interface ARC Interface Connections The 9-way D-type serial interface connector is located on the instrument rear panel.
- Page 32 The ARC standard for the other interface parameters is as follows: Start bits Data bits Parity None Stop bits In this instrument, as with most other ARC instruments, these parameters are fixed. ARC Character Set Because of the need for XON/XOFF handshake it is possible to send ASCII coded data only; binary blocks are not allowed.
- Page 33 available, if any, and then exit the talk addressed state. Only one response message will be sent each time the instrument is addressed to talk. Talk mode will be cancelled by any of the following interface control codes being received: 12H LAD Listen Address for any instrument.
- Page 34 ARC Remote Command Formats Commands are sent as by the controller. A consists <PROGRAM MESSAGES> <PROGRAM MESSAGE> of zero or more each separated by a <PROGRAM MESSAGE UNITS> <PROGRAM MESSAGE UNIT which is the semi-colon character ‘;’ (3BH). SEPARATOR> is any of the commands in the REMOTE COMMANDS section. <PROGRAM MESSAGE UNIT>...
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Page 35: Remote Commands
Remote Commands This section details all the commands available. Note that each command is completely executed before the next command is started. When a command generates a response that response will be sent immediately if in non-addressable mode or when addressed to talk if in addressable mode. -
Page 36: Main Display Commands
V (for diode test) Examples: 101.23e-3 V DC (101.23mV) -10.001e00 V DC (-10.001V) 00.123e00 V AC+DC (0.123V) 100.01e03 Hz (100.01kHz) 01.010e-6 F (1.01µF) READ2? Returns the next reading from the secondary display immediately after the command has been parsed. The syntax is as for READ? described above. If the secondary display is currently showing the range of the main display the response will be RANGE. - Page 37 IDC [<string>] Sets the main display to dc Amps and optionally sets the range; if no range is specified the display defaults to mA autorange. The following <strings> can be used to set the range: <1MA>, <100MA>, <10A> IAC [<string>] Sets the main display to ac Amps and optionally sets the range;...
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Page 38: Dual Measurement Mode Commands
Dual Measurement Mode Commands VDC2 Sets the secondary display to dc Volts (autoranging). VAC2 Sets the secondary display to ac Volts (autoranging). IDC2 [<string>] Sets the secondary display to dc Amps and optionally selects mA (autoranging) or the 10A range; if no range is specified the existing setting is used. -
Page 39: Second Level Modifier Commands
<50>, <75>, <93>, <110>, <124>, <125>, <135>, <150>, >250>, <300>, <500>, <600>, <800>, <900>, <1000>, <1200>, <8000>. DBOFF Cancels DB mode. Second Level Modifier Commands DELTA [<nrf>] Selects the Delta % function and optionally sets the reference value; if no reference is specified the existing value is used. -
Page 40: Data Logging Commands
AXB? Returns the result of the Ax+b scaling function. The syntax of the response is: <ASCII data><rmt> where <ASCII data> is a 10-character string in the same format as the first (value) field of the standard READ? response, see that command for details. If Ax + b is not running a zero value will be returned. -
Page 41: Calibration Commands
three spaces. The following two fields each of 8 digits, contain the measurement value and measurement units respectively, in exactly the same format as the response to the standard READ? command, see that command section for details. TRIG With the data logger on, a reading will be stored each time the TRIG command is set. Since the remote command is OR’ed with the internal timer, either both can be run together or the internal timer can be disabled by setting the interval to 0000 seconds. -
Page 42: Default Settings
Default Settings The meter is put into the following default condition as a result of a system reset (hold Cancel down at switch on) or by the ∗RST remote command. Function set to DC Volts, single measurement mode. Autoranging mode set. All first level modifiers cancelled, including Ohms Null. - Page 43 TEST EQUIPMENT RISK ASSESSMENT Recommendation from the U.K. Health and Safety Executive Users of this equipment and or their employers are reminded that Health and Safety Legislation require them to carry out valid risk assessments of all electrical work so as to identify potential sources of electrical danger and risk of electrical injury such as from inadvertent short circuits.