Brochure

Technical Specifications - 1908 and 1908P
MEASUREMENT PARAMETERS & 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.
Scale Length
The scale length is 120,000 counts (unless otherwise stated) giving a maximum
measured value for each range of 119999. Thus for the 100V range the maximum
measured value is 119.999 volts
Accuracies are quoted in terms of a percentage of the measured value plus a number
of least significant digits.
Reading Rate
Varies with measurement parameter. Selectable as 4 readings/second or 20
readings/second for most parameters.
DC Voltage
Range Accuracy Resolution
100mV 0.02% ± 3 digits* 1µV * after null
1000mV 0.02% ± 3 digits. 10µV
10V 0.02% ± 3 digits. 100µV
100V 0.02% ± 3 digits 1mV
1000V 0.02% ± 3 digits 10mV
Input Impedance: 10MW//<100pF, except for Vdc plus Vac measurement when the
1MW ac attenuator is in parallel with the 10MW dc attenuator.
Maximum Input: 1kV DC or AC peak, any range.
NMR: >60dB at 50/60Hz.
CMR: 1kW unbalanced CMR is >90dB at DC/50Hz/60Hz.
Max. AC volts Maximum AC voltage (45Hz-50kHz) that can be applied without
affecting the accuracy of the DC measurement.
Range 100mV 1000mV 10V 100V 1000V
Max. AC 6V 6V 80V 200V 1000V
AC Voltage (True RMS)
Range Accuracy Resolution
45Hz - 10kHz 10kHz - 30kHz 20kHz - 100kHz
100mV 0.3% ± 100 dig.. 1.5% ± 100 dig.. 5% ± 200 dig. 1µV
1000mV 0.3% ± 100 dig... 0.5% ± 100 dig 3% ± 100 dig. 10µV
10V 0.3% ± 100 dig... 0.5% ± 100 dig 3% ± 100 dig. 100µV
100V 0.3% ± 100 dig. 0.5% ± 100 dig 3% ± 100 dig. 1mV
750V 0.3% ± 100 dig. 0.5% ± 100 dig 3% ± 100 dig. 10mV
Accuracy specifications apply for readings between 10,000 and 120,000 counts.
Additional error at crest factor = 3 is typically 0.5%.
Input Impedance: 1MW//<100pF
Maximum Input: 750V rms, 1000V peak; any range.
CMR: 1kW Unbalanced CMR is >60dB at DC/50Hz/60Hz
AC + DC Voltage
Total measurement error will not exceed the sum of the separate ac and dc accuracy
specifications plus 10 digits.
Resistance
Range Accuracy Resolution
100mW 0.05% ± 8 digits 1mW
1000mW 0.05% ± 5 digits. 10mW
10W 0.05% ± 5 digits. 100mW
100W 0.05% ± 5 digits 1W
1000W 0.3% ± 2 digits 10W
Maximum Input: 1000V DC or AC rms, any range.
Max. O/C Voltage: 3.5V
DC Current
Range Accuracy Resolution
10mA 0.05% ± 5 digits 100nA
100mA 0.05% ± 5 digits. 1µA
1000mA 0.2% ± 5 digits. 10µA
10A (<5A) 0.2% ± 5 digits 100µA
10A (>5A) 0.5% ± 10 digits 100µA
Maximum Input: mA ranges - 1.6A DC or AC rms, 1000V, fuse protected.
10A range - 10A DC or AC rms, 1000V, fuse protected.
Voltage Burden: 10mA range - <100mV, 100mA, 1A, 10A ranges - <600mV
AC Current (True RMS)
Range Accuracy (45Hz to 10kHz) Resolution
10mA 0.35% ± 20 digits 100nA
100mA 0.35% ± 20 digits. 1µA
1000mA 0.5% ± 20 digits. 10µA
10A (<5A) 0.5% ± 20 digits 100µA
10A (>5A) 1% ± 20 digits 100µA
Accuracy specifications apply for readings between 10,000 and 120,000 counts.
Additional error at crest factor = 3 is typically 0.5%.
Maximum Input: mA ranges - 1.6A DC or AC rms, 1000V, fuse protected.
10A range - 10A DC or AC rms, 1000V, fuse protected.
Voltage Burden: 10mA range - <100mV, 100mA, 1A, 10A ranges - <600mV10mA range - <100mV, 100mA, 1A, 10A ranges - <600mV
AC + DC Current
Total measurement error will not exceed the sum of the separate ac and dc accuracy
specifications plus 10 digits.
Frequency
Range Accuracy Resolution
100Hz 0.01% ± 1 digit 0.01Hz
1000Hz 0.01% ± 1 digit. 0.1Hz
10kHz 0.01% ± 1 digit. 1Hz
100kHz 0.01% ± 1 digit 10Hz
Scale Length: 12,000 counts
Frequency Range: 10Hz to >100kHz
Input sensitivity: Better than 30mVrms (100mV range);
better than 10% of range for all other Vac and Iac ranges.
Capacitance
Range Accuracy Resolution
10nF 2% ± 5 digits 10pF
100nF 2% ± 5 digits. 100pF
1µF 2% ± 5 digits 1nF
10µF 2% ± 5 digits 10nF
100µF 5% ± 5 digits 100nF
Scale Length: 1200 counts
Temperature
Linearised measurement for PT100 or PT1000 RTD probes, 2-wire or 4-wire
measurement, display in
o
C or
o
F.
RTD Range Accuracy Resolution
PT100 -50 to 400
o
C 0.05% ± 0.5
o
C 0.1
o
C
PT1000 -50 to 400
o
C 0.05% ± 0.5
o
C 0.1
o
C
N. B. Accuracy specifications apply to multimeter only, they do not account for additional probe accuracy
errors.
Continuity and Diode Test
Continuity: 100W range selected; audible tone sounds for impedance <10W.
Diode Test: Test current approximately 1mA; displays voltages up to 1.2V.
Max. O/C Voltage: 3.5V
Maximum Input: 1000V DC or AC rms, any range.
EXTERNAL REMOTE TRIGGER (TTL/CMOS)
Connection: Terminal block on rear panel.
Input: Input to the LED of an opto-isolator through 1kW resistor.
Apply >+3V to trigger remote input. Max. Voltage 10V.
Output: Opto-isolated open collector output, conducts for 250ms on
completion of input trigger. Max. off-state Voltage: 10V.
On state sink current 2mA (typical).
DISPLAY
Display Type: High contrast backlit transflective LCD.
Main display 5½ digits 17mm high,
Secondary display 6 digits 10mm high.
Scale Length: 120,000 counts for most measurement parameters
Annunciators: LCD annunciators for all ranges, functions and program modes.
Overrange: Displays OFL if input too large for range.
Overflow: Displays -Or- if calculated result overflows display.