Fluke 5520A - 6-50. AC Voltage Frequency Verification

5520A
Service Manual
6-34
6-50. AC Voltage Frequency Verification
This procedure uses the following equipment:
• PM 6680 Frequency Counter with an ovenized timebase (Option PM 9690 or PM
9691)
• BNC cable supplied with the SC600
At 50 MHZ
SC600 Cable
PM 6680A
5520A-SC600
HI
LO
TRIG
GUARD
TC
20A
1000V
RMS
MAX
20V
RMS
MAX
20V
PK
MAX
1V PK
MAX
SHELLS
NOT
GROUNDED
NORMAL AUX
SCOPE
OUT
V, , ,
RTD
A, -SENSE,
AUX V
150V
PK
MAX
20V
RMS
MAX
20V PK MAX
20V PK MAX
5520A
CALIBRATOR
yg057f.eps
Figure 6-6. AC Voltage Frequency Verification Setup
Set the Calibrator Mainframe to SCOPE mode, with the Volt menu on the display. Press
O on the Calibrator Mainframe to activate the output. Then follow these steps to
verify ac voltage frequency.
1. Set the PM 6680’s FUNCTION to measure frequency on channel A with auto trigger,
measurement time set to 1 second or longer, 1MΩ impedance, and filter off.
2. Using the BNC cable, connect the SCOPE connector on the Calibrator Mainframe to
PM 6680 channel A.
3. Program the Calibrator Mainframe to output 2.1 V at each frequency listed in Table
6-23.
4. Allow the PM 6680 reading to stabilize, then record the PM 6680 reading for each
frequency listed in Table 6-23. Compare to the tolerance column of Table 6-23.
Table 6-23. AC Voltage Frequency Verification
Calibrator Mainframe
Frequency
(output @ 2.1 V p-p)
PM 6680 Reading
(Frequency) Tolerance
10 Hz 0.000025 Hz
100 Hz 0.00025 Hz
1 kHz 0.0025 Hz
10 kHz 0.025 Hz