OPERATION
Zero Verification and Correction
1. Allow the instrument to warm up for one hour after power up.
2. Turn zero check on by pressing the ZERO CHECK button. The ZERO
CHECK indicator light will turn on.
3. Select the function and range that will be used. If unsure of range,
select the lowest range.
4. If the display does not read zero, press the ZERO CORRECT button.
The ZERO CORRECT indicator light will turn on and the display will
read zero.
5. Take the instrument out of zero check by again pressing the ZERO
CHECK button. The ZERO CHECK indicator light will turn off.
8. The instrument is now zeroed and ready to make measurements.
NOTES
1. The instrument can be rezeroad at any time by turning zero correct
off (ZERO CORRECT indicator light off) and repeating steps 1
thmugh 5.
2. Correction is automatically scaled when range is changed. However,
it is recommended that zero be checked after range or function is
changed. If range or function is to be changed without rezeroing, in-
itially zero correct on the lowest range of the function to be used.
3. Check zero every 24 hours, or whenever there is a > 1 OC temperature
change.
4. On power up, zero check is on.
TYPICAL USE
Zero the 2pA range to ensure accurate measurements on that range.
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