Fluke 2625A - Manual (Page 135)

Maintenance
Performance Tests
6
6-7
Accuracy Verification Test
1. Power up the instrument and allow it to temperature stabilize for 1/2 hour.
2. Connect a cable from the Output VA HI and LO connectors of the 5700A to the V
Ω
and COM connectors on the front panel of the Hydra Series II Instrument. Select the
channel 0 function and range on the Hydra Series II and the input level from the
5700A using the values listed in Table 6-3. Press the MON (monitor) button to
measure and display the measurement value for channel 0. The display should read
between the minimum and maximum values listed in the table.
Channel Integrity Test
Assure the Accuracy Verification Test for channel 0 meets minimum acceptable levels
before performing this test.
1. Switch OFF power to the instrument and disconnect all high voltage inputs.
2. Remove the Input Module from the rear of the instrument. Open the Input Module
and connect a pair of test leads to the H (high) and L (low) terminals of channel 1.
Install the Input Module back into the instrument.
3. Connect the ends of the test leads together to apply a short (0 ohms).
4. Reconnect power and switch the instrument ON.
5. For channel 1, select the 2-terminal ohms function and 300 ohms range on the Hydra
Series II Instrument. Press MON and ensure the display reads a resistance of less
than or equal to 4.0 ohms. (This test assumes that lead wire resistances are less than
0.1
e.)
6. Open the ends of the test leads and ensure that the display reads "OL" (overload).
7. Press MON. This will stop the measurement.
8. Connect a cable from the Output VA HI and LO of the 5700A to the Input Module
test leads (observe proper polarity).
9. Select the VDC function and 300 volt range on the Hydra Series II and apply first
0V dc then 290V dc input from the 5700A. Ensure the display reads between the
minimum and maximum values as shown in Table 6-3 for the 0 and 290V dc input
levels.
Note
Channels 0, 1, and 11 can accommodate a maximum input of 300V dc or
ac. However, the maximum input for all other channels can only be 150V
dc or ac.
10. With the exception of the selected voltage range and input voltage from the 5700A,
repeat steps 1 through 9 for each remaining Input Module channel (2 through 20).
Channels 2 through 10 and 12 through 20 should be configured for the 150V dc
range and an input voltage of 150 volts.