Fluke 5700A Series User Manual

5700A/5720A Series II Calibrator
Service Manual
5-48
4. Check the 220 µA range of the 220 µA/2.2 mA AMP circuit. Set the Calibrator to
200 µA, standby. Set the external ac reference to 6.4V(±0.1V) at 1 kHz. Using a
DMM, measure the ac voltage at the collector of Q4 and verify it is 2.0V ac ±10%. If
a failure is detected, first verify that the 10 kΩ shunt on HR2 is correct and that it is
connected to SCOM thought relays K5C, K5D, K10, K13 and the 1.2Ω load resistor
R14 as in Figure 5-8. If the shunt and output switching is correct check Q4, Q5, K3,
and the associated components in the 220 µA/2.2 mA AMP circuit.
1 V
10 ms
F5-7.EPS
Figure 5-7. Waveform at Pin 6 of K2
10 k
HR2
SHUNT
1.2
R14
2V ac
±10% K5C, K5D,
K10, K13
SCOM
Ω
Ω
F5-8.EPS
Figure 5-8. Verifying the 220 µA Range of the 220 µA/2.2 mA Amp Circuit
5. Check the 2.2 mA Range of the 220 µA/2.2 mA AMP. Set the Calibrator to 2 mA,
standby. Set the external ac reference to 6.4V at 1 kHz. Measure the ac voltage at the
collector of Q4 with a DMM and verify it is 2.0V ac ±10%. If a failure is detected,
first verify the 1 kΩ shunt on HR2 is correct and it's connected to SCOM through
relays in K7A, K5D, K10, K13 and 1.2Ω load resistor R14 as shown in Figure 5-9. If

Fluke 5700A Series Specifications

General

Type	Multifunction Calibrator
Operating Temperature	0°C to 50°C
Storage Temperature	-40°C to 70°C
Humidity	10% to 90% non-condensing
Frequency Range	10 Hz to 1 MHz
Accuracy	Varies by function and range. See manufacturer's specifications for details.
Output Stability	Varies by function and range. See manufacturer's specifications for details.
Power Requirements	50 Hz to 60 Hz