QuadTech Guardian 5000 Instruction Manual page 18

Proceed as follows for automatic zeroing/offset:
•
Plug the appropriate cable (or other fixture) into the front panel OUTPUT connectors,
with no device connected. Refer to paragraph 2.3 for cable configurations based on test
to be made. Test leads used for an AC Hipot, DC Hipot or Insulation Resistance
measurement should be open and those leads used for the ground continuity measurement
be shorted together before performing the zeroing offset.
•
With the instrument in the power-up state (or in any other desired setup, refer to
paragraph 2.4 for recalling setups) press the OFFSET key.
STEP
1
OFF ON
•
Display should read OFSt and GEt. Push the START button to initiate the automatic
storage of the offset value for all tests within a sequence.
•
The offset will remain on until turned off by pressing the OFFSET key twice. If the
instrument is powered down with the offset on it remains in effect when the unit is again
powered up.
The following formulas apply to the offset function:
For AC offset current < 80µA:
For DC offset or AC offset current ≥ 80µA:
Operation 2-2
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R
OFSt
W-ACV
AC
W-DCV
DC
I-R
RMT LOCK
7
STOP START
4
1
0
Display current =
Display current = (current read) - (offset current)
A
HI
GEt
KV LO
V ARC
OFFSET HI-NG LO-NG ARC-NG
8 9 PROG RCL
5 6 DELE STO
CLEAR OFFSET
2 3
.
OFF ENTER
( ) (
2 −
current read offset current
TIMER
m
SEC
5.0
uA mA TEST
M G RAMP
PASS
CURSOR
)
2
Offset Key