8845A/8846A
Calibration Manual
3-4
Table 3-1. Required Test Equipment (cont.)
Function Instrument Type Model Comments
Standard Fluke 5520A Must be characterized with 8508A
8½ digit meter Fluke 8508A Used to characterize the 5520A
4-wire short Fluke low thermal 4-wire
short or equivalent
Fluke PN 2653346
Alternate standard Fluke 5720A or equivalent
Ohms
Alternate standard
resistor
Fluke 8508A-7000K
1 Gohm resistor or
equivalent (better than
±0.35 % maximum
uncertainty)
Used for calibrating/verifying 1 GΩ
range in the 8846A when a 5520A
is not available.
Standard Fluke 5520A TURS <4:1 at 1 nF, 10 nF, 100 μF,
1 mF, and 10 mF.
Capacitance
(8846A only)
Alternate
standards
1 nF, 10 nF, 100 nF, 1 μF,
10 μF, 100 μF, 1 mF,
10 mF, and 100 mF
standards
Standards must be ±0.25 % and
rated for at least 5 V
Standard Fluke 5520A Must be characterized with 8508A
8½ digit meter Fluke 8508A Only used to characterize the
5520A
Current dc
Alternate standard Fluke 5720A with Fluke
5725A
Note: TUR <4 at 10 A
Standard Fluke 5520A Must be characterized with 8508A
8½ digit meter Fluke 8508A Only used to characterize the
5520A or 5720A
Current ac
Alternate standard Fluke 5720A with Fluke
5725A
TUR at 1 A at 5 kHz < 4:1. Must
characterize with 8508A at 100 μA
at 5 kHz. 100 μA, 1 mA, 10 mA, 100
mA, 1 A and 2 A at 10 kHz.
To reduce the possibility of inducing errors with ac signals picked up by the test
leads, use short, shielded twisted-pair PTFE-insulated test cables between the test
equipment and the Meter. Fluke makes a 2 foot (PN 738716) and 4 foot (PN 738724)
PTFE insulated test cable for this purpose.
Cables
Fluke USB to RS232 cable (PN 2675479) or Fluke IEEE 488 cable (2 meter, PN
708297)
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