Valhalla 2300, Operation Manual

Page: 63 / 115

connector are shown in Figure 3-2 at the front
of this manual. The adjustments are accessed
by removing the bottom cover of the
instrument.
Caution! AC line power is
exposed at this point. The IO-3 adjustment
potentiometers are located on a small PC
board near the AC receptacle.
8-7-1. IO-3 Volts Calibration
Connect the DVM negative lead to pin 3 of
the IO-3 connector on the rear panel. Connect
the DVM positive lead to pin 6. Apply 15.00
volts (1/10 of full scale) to the 2301. Adjust
RV2 "Volts Zero" on the IO-3 board for .5000
volts on the DVM. Apply 150.00 volts (full
scale) to the 2301 and adjust RV1 "Volts
Scaling" for 5.000 volts on the DVM. Repeat
as necessary for minimum interaction.
8-7-2. IO-3 Amps Calibration
Connect the DVM negative lead to pin 2 of
the IO-3 connector. Connect the DVM
positive lead to pin 1. Apply .1000 amps
(1/10 of full scale) to the 2301. Adjust RV4
"Amps Zero" for .5000 volts on the DVM.
Apply 1.0000 amp (full scale) to the 2301.
Adjust RV3 "Amps Scaling" for 5.000 volts
on the DVM. Repeat as necessary for
minimum interaction.
8-7-3. IO-3 Watts Calibration
Connect the DVM negative lead to pin 4 of
the IO-3 connector. Connect the DVM
positive lead to pin 5. Apply 15.00 volts and
1.0000 amp (1/10 of full scale watts) to the
2301. Adjust RV6 "Watts Zero" for .5000
volts on the DVM. Apply 150.00 volts and
1.0000 amp (fullscale watts) to the 2301.
Adjust RV5 "Watts Scaling" for 5.000 volts
on the DVM. Repeat as necessary for
minimum interaction.
)
If IO-3 is installed in a Model 2300 as
opposed to a 2301, RV6 should be used
to adjust the "Watts Zero" output for
.2500V, not .5000V. The adjustment of
RV6 is eliminated in the 2300.