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GPS -8145 Operation Manual

Bench-type multimeter
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GPS-8145
Bench-type Multimeter
Operation Manual

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Summary of Contents for GPS GPS-8145

  • Page 1 GPS-8145 Bench-type Multimeter Operation Manual...

  • Page 2: Safety Instructions

    GPS-8145 Bench-type Multimeter 1. GENERAL GPS-8145 is an intelligent and multi-functional device for various measurement. It features high quality, high accuracy, high reliability, special high frequency measurement and low cost. The meter is in compliance with IEC 6010 CAT II 1000V and CAT III 600V high voltage standards. Other features of this instrument are listed below: ...

  • Page 3: Panel Instructions

    GPS-8145 Bench-type Multimeter 2. PANEL INSTRUCTIONS Fig.2-1 Front panel Fig. 2-2 Rear Panel General Polytronic Systems Ltd. - 2 -...
  • Page 4 GPS-8145 Bench-type Multimeter 1. Power switch: turns the meter on or off 2. Auxiliary keys: SELECT, RANGE, SET, MAX/MIN, Timer/RS232/HOLD/2nd VIEW/ REL △ SELECT: Selects measurement mode RANGE: Selects measurement range. The meter is default at auto range mode. SET: ...
  • Page 5 GPS-8145 Bench-type Multimeter 2nd VIEW: Selects the secondary display function. In various measuring mode, press 2nd VIEW button to cycle the displayed data on secondary display. Se the follow table: Function key Measuring mode Primary display Secondary display ACV+Hz AC dBm+Hz...
  • Page 6 GPS-8145 Bench-type Multimeter 20A: Ampere current measurement terminal 4. Function Key : ACV : Diode & Continuity : DCV : Resistance Ω : DC/AC Milli voltage DUTY/Hz: Duty/Frequency 5. LCD Display: The following table gives description of the symbols displayed on the LCD.

  • Page 7: Special Functions

    GPS-8145 Bench-type Multimeter 6. AC110V/220V selector switch 7. Fuse 8. Power plug 9. RS232 interface 3. SPECIAL FUNCTIONS 3.1 Auto Power Off The meter has two power off function. In normal conditions when the meter is power on, if there is no operation on any of the buttons or function keys within 30 mints, the meter will be automatically powered off.
  • Page 8 GPS-8145 Bench-type Multimeter syntherization. 3.6 Measurement Range A measurement range determines the measuring limits. The meter has several measurement ranges. Select a proper measurement range:  If the selected measurement range is too small (the testing signal exceeds the measurement range), the meter will display “OL”...
  • Page 9 GPS-8145 Bench-type Multimeter NOTE: In dBm measurement mode, the decimal point of dBm is fixed between the second and third digits. When in dBm measurement, the impedance is default at 600Ω. To change the impedance, press RANGE button to select a proper impedance. The impedance can be chosen from: 4/8/16/32/50/75/93/110/125/135/150/200/250/300/500/600/800/900/1000/1200Ω.
  • Page 10 GPS-8145 Bench-type Multimeter the measurement, press RANGE button to select a proper range. There are two ranges to choose from: 80.000mV/800.00mV  Connect the black test lead to “COM” terminal and the read test lead to “V Ω Hz” terminal.
  • Page 11 GPS-8145 Bench-type Multimeter capacitors. Remove the meter and restore the circuit to normal operation. Pull out the test lead from “mA” terminal. Press SELECT Primary display Secondary display Press 2nd VIEW DCmA DCmA ACmA ACmA DCmA+ ACmA DCmA+ ACmA ACmA...
  • Page 12 GPS-8145 Bench-type Multimeter record.  The meter is in auto range mode and will automatically select a most suitable range. To select a range manually for the measurement, press RANGE button to select a proper range. There are six ranges to choose from: 800.00Ω/8.0000kΩ/80.000kΩ/800.00kΩ/8.0000MΩ/80.000MΩ...
  • Page 13 GPS-8145 Bench-type Multimeter Measurement Primary display Secondary display mode nF/μF MAX/MIN, REL△ parameters 4.8 Frequency (Hz) and Rotation Speed Measurement (RPM) The measurement of frequency and rotation speed measurement have three modes: normal, Hi Hz and RPM.  Set the function key to “Hz” position.
  • Page 14 GPS-8145 Bench-type Multimeter RPM Measurement In RPM mode, the testing range is 0~99999RPM, accuracy ±(0.05% of reading+5). Use the RPM accessory to test the rotation speed and read the display. Measurement mode Primary display Secondary display No display 4.9 Temperature Measurement (TEMP) The measurement of temperature has two modes: normal and Hi.

  • Page 15: Programmable Control

    GPS-8145 Bench-type Multimeter Connect the black test lead to “COM” terminal and the red test lead to “VΩ Hz” terminal. Press 2nd VIEW button to select the frequency from the following ranges: 0.5000Hz/1.0000Hz/2.0000Hz/10.000Hz/50.000Hz/60.240Hz/74. 63Hz/100.00Hz/151.50Hz/200.00Hz/303.00Hz/606.10Hz/1.2500 kHz/1.6660kHz/2.5000kHz/5.0000kHz Press SELECT button to select the duty cycle from 1% to 99% Press 2nd VIEW button for at least 2 seconds to return to default square wave output.
  • Page 16 GPS-8145 Bench-type Multimeter 5.7 Auto Schedule In this function, user can set up the start and end time of recording. 5.8 Open File This function opens the stored files (History.txt), which include text file and graph file. The files can be renamed or printed out.

  • Page 17: Specifications

    GPS-8145 Bench-type Multimeter 5.13 Real-time Graph Window Before applying this function, user must choose a desired measuring range. The X axis indicates system time, while the Y axis indicates the range of testing data. 5.14 Recorder Control Panel In this panel function, user can set up the recording time, max.and min. values. The Start, Stop and Reset buttons are used to control the data recorder.
  • Page 18 GPS-8145 Bench-type Multimeter Table 2. ACV (True RMS) Range Resolution Accuracy 80mV 1μV <75% Range: 50Hz~20kHz <75% Range: 20kHz~50kHz >75% Range: 50Hz~20kHz 800mV 10μV ±(0.8% rdg+50) ±(6.0% rdg+50) ±(8.0% rdg+50) 0.1mV <75% Range: 50Hz~10kHz ±(0.8% rdg+50); >75% Range: 50Hz~10kHz 750V 10mV 50Hz~1kHz: <90% Range ±...
  • Page 19 GPS-8145 Bench-type Multimeter Table 8. Capacitance Range Resolution Accuracy Remarks ±(5.0% rdg+50) 10nF 10pF 100nF 100pF Overload protection: 250V RMS 1μF ±(2.5% rdg+50) 10μF 10nF 100μF 100nF Table 9. Diode Range Accuracy Resolution Remarks Diode positive voltage drop 3.0000V ±(3.0% rdg+5) 0.0001V...
  • Page 20 GPS-8145 Bench-type Multimeter 7. MAINTENACE The meter is a precise and intelligent instrument. It has been accurately calibrated in the factory before shipment. Readjustment is recommended only if repairs have been made in a circuit affecting adjustment accuracy or if you have a reason to believe the unit is out of adjustment.
  • Page 21 GPS-8145 Bench-type Multimeter 7.2 Troubleshooting If the meter does not work properly, take actions as described in this manual to check out if the meter is defective or not. Once defective or malfunctioning is confirmed, please contact your local distributor or the manufacturer for repairing.

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