Martel Electronics BetaGauge 3II - Manual (Page 46)

3-11 Basic Operations
Zeroing the Milliamp Input
Use the following procedure to zero the milliamp input
on the DC module:
1. Install the module in either module bay (channel)
of the BetaGauge II.
2. Ensure that the BetaGauge II is on.
3. Ensure that the module’s milliamp jacks are open
circuit. This is done by ensuring that no test leads
are attached to either the positive milliamp jack or
the common jack.
4. Ensure that the BetaGauge II is displaying the first
four Setup menu items (Trip, Unit, Damp, and
V/mA).
NOTE: Only this menu display allows for both
channel selection and ZERO key operation.
5. Press the channel select key corresponding to the
module bay where the DC module is installed
(CH1 for the left side, or CH2 for the right side).
6. Press the ZERO key.
7. The milliamps display should now be zeroed.
NOTE: The milliamps display may drift slightly
from zero in the first few minutes after initial
power up. If so, press the ZERO key again while
the appropriate channel is still selected.