Pacific UPC-32, Operation Manual, Page: 37 / 140

SECTION 3 INSTALLATION
25
3.4.2 CONFIGURE AMPS TO VOLTS RATIO
NOTE: Most users will not need to concern themselves with the following configuration issue as it is set
at the factory if the UPC is packaged with a power source.
The ammeter scale is selected by the AMPS TO VOLTS RATIO SWITCH multiplied by a factor of 10.
The AMPS TO VOLTS RATIO scales the voltage fed into the ammeter circuit input to represent a given
amount of current. This switch may be set from 1 to 15, 10-150 or 100-500. If 5 is selected then the
amps to volts ratio is:
5 A (load current) = 1 V (input to ammeter circuit) = 5 A displayed.
In this case, the ammeter range is 50 A (5 x 10).
Set the AMPS TO VOLTS RATIO of the UPC to match the Power Source. Refer to the Power Source
Manual to determine the AMPS TO VOLTS RATIO of the Power Source model. The ratio is set by the
AMPS TO VOLTS RATIO SWITCH on the UPC METERING PCB (figure 3.4.1). The 4 LSB's of the Dip-
switch are binary weighted. See section 3.4.4 for information on configuration switch S2-7. Shown
below are sample settings. Note that not all allowable values are shown:
DIP-SWITCH SETTING
S2-6 S2-5 S2-4 S2-3 S2-2 S2-1
WEIGHT:
X100
X10
8
4
2
1
RATIO
NA
(DO NOT USE) OFF OFF OFF OFF OFF OFF
1 OFF OFF OFF OFF OFF ON
2 OFF OFF OFF OFF ON OFF
3 OFF OFF OFF OFF ON ON
4 OFF OFF OFF ON OFF OFF
5 OFF OFF OFF ON OFF ON
6 OFF OFF OFF ON ON OFF
7 OFF OFF OFF ON ON ON
8 OFF OFF ON OFF OFF OFF
9 OFF OFF ON OFF OFF ON
10 OFF OFF ON OFF ON OFF
11 OFF OFF ON OFF ON ON
12 OFF OFF ON ON OFF OFF
13 OFF OFF ON ON OFF ON
14 OFF OFF ON ON ON OFF
15 OFF OFF ON ON ON ON
20 OFF ON OFF OFF ON OFF
50 OFF ON OFF ON OFF ON
100 ON OFF OFF OFF OFF ON
200 ON OFF OFF OFF ON OFF
400 ON OFF OFF ON OFF OFF
NOTE: S2-7 MUST be set “ON” if the attached power source has only 2 power amplifiers.