2548H INSTRUCTION MANUAL
56-101-00420 Rev. C
Ch. 1
Nov
/
07
/
14
Page 7 of 33
(5)
TEST FUNCTION
is a rotary switch, which selects one (1) of five (5) test functions.
When the Test Set is placed in the CAP SIM 1 or CAP SIM 2 function, the meter may
be substituted for a DC meter-type fuel quantity indicator.
(6)
INS TEST POINTS
selector switch permits selection of one (1) of six (6) pairs of
different test points for insulation leak tests.
(6A)
RANGE
selects x1 or x.01 M
Ω
for display during insulation tests.
(7) The
INDICATOR
banana jacks are used for indicator input connections for 0-1100 µA
meter testing or substitution.
(8)
METER ADJUST
is a linear potentiometer, which controls the 0-1100 µA test current
or adjusts the megaohmmeter for infinity (
∞
), full scale setting. When the INDICATOR
switch is selected, this component provides an adjustable current through the panel
meter to the indicator jacks.
(9) The
PANEL METER
is a DC taut-band micro ammeter, which provides the 0-1100 µA
current scale, 0-5000 M
Ω
scale and battery condition scale. Its circuitry components
allow adjustments for all test functions from full scale to 1100 µA.
(10) The
BATTERY
COMPARTMENT
contains the batteries or the optional AC power
supply. The four (4) 9V batteries are connected to provide a bipolar 18 VDC supply
that is controlled through the ON/OFF switch. The optional 115 VAC or 230 VAC
power supply assembly is interchangeable with the DC battery supply assembly. The
AC supply is short-circuit protected and warranted by the manufacturer.
(11)
ON/OFF
is a toggle switch that provides the output battery or AC power supply.
(12)
BATT TEST
is a pushbutton, which when pressed, connects the panel meter as a full-
scale meter 0-37.4 voltmeter across the battery supply. (The BATT OK measurement
line indicates 24.8V.)
(13)
TANK CAP pF
thumbwheel assembly selects the capacitance simulator value
between HI-Z COAX and LO-Z TANK jacks or bridge value.
(14)
HI-Z COAX
, a BNC receptacle, provides a HI-Z connection for the bridge and the
simulators.
(15)
LO-Z TANK
, a polarized BNC receptacle provides a LO-Z connection for the bridge
and the tank simulators.
(16)
LO-Z COMP
is a polarized BNC receptacle connection for the compensator simulator.
(17)
COMP SIM
pF
is a 100’s-10’s thumbwheel assembly and a 0-10 pF variable for setting
compensator capacitance between HI-Z COAX and LO-Z COMP.
(18) The
COMP CAL
is a pushbutton which, when pressed, connects the compensator
simulator to the capacitance bridge.
