Test Equipment Depot 88 Service Manual page 17

mA/A AC (45 Hz to 2 kHz)
Range
40.00 mA
400.0 mA
4000 mA
10.0 A*
* 10 A continuous, 20 A overload for 30 seconds maximum.
** Below reading of 200 counts, add 10 digits.
Frequency, RPM, Duty Cycle, and Pulse Width
Function Range
Frequency** 199.99
(0.5 Hz to 1999.9
200 kHz, 19.999 kHz
Pulse Width 199.99 kHz
>2 µs)
>200 kHz
RPM 1 30-9,000
RPM 2 60-12,000
% Duty Cycle*** 0.0-99.9%
(0.5 Hz to 200 kHz, Pulse Width > 2 µs)
Pulse Width *** 0.002-1999.9 ms
(4 Hz to 200 kHz, Pulse Width > 2 µs)
* Pulse Width range is determined by the frequency of the signal.
** Frequency measurements can be made on voltage or current inputs. The current inputs are always
dc-coupled.
*** For rise times < 1 µs. Duty Cycle accuracy: within ±(0.2% per kHz + 0.1%). Pulse Width accuracy:
±(00.002 ms + 3 digits).
Counter Sensitivity and Trigger Level
Input Range* Minimum Sensitivity @ 0.5 Hz-200
400.0 mV dc
400.0 mV ac
4.000 V
40.00 V
300.0 V
Maximum input for specified accuracy = 10 × Range or 300 V.
Resolution
0.01 mA
0.1 mA
1 mA
0.01 A
Resolution
0.01 Hz
0.1 Hz
0.001 kHz
0.01 kHz
0.1 kHz
1 RPM
1 RPM
kHz (RMS Sinewave)
70 mV (to 400 Hz)
150 mV
0.7 V
7 V
70 V (≤140 kHz)
Introduction and Specifications
Accuracy **
±(3%+10)
±(3%+5)
±(1.5%+5)
±(1.5%+5)
Pulse Width
Accuracy
Range (ms)*
±(0.01%+1)
1999.9
±(0.01%+1)
5.00
±(0.01%+1)
0.500
±(0.01%+1)
0.0500
Unspecified
± 2 RPM
± 2 RPM
Approximate Trigger Level (DC
Voltage Function)
40 mV
Specifications
Burden Voltage
(typical)
2.3 mV/mA
2.3 mV/mA
0.03 V/A
0.03 VA
Resolution
(ms)
0.1
0.01
0.001
0.0001
-
1.7 V
4 V
40 V
1
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