Sect. 11 Page 1
SECTION II
OPERATING I NSTRU CTlONS
SECTION IIA CAL ADJUST
This screwdriver adjustment is used to calibrate
2A-1 GENERAL the constant current source. See paragraph 2-9.
The operating instructions for the 500B and the 500C EXPAND
- are given in two separate sections. The 500B is Expands any 10 percent (X10) or any 30 percent (X3)
covered in Section IIB and the 500C is covered in of the basic range in use to full scale. Use of
Section IIC. The instruments are identical elec- the expanded scale is discussed in paragraph 2B-3.
trically. The only difference is the meter face
calibration and the range selector markings. The INPUT
paragraphs in the 500B which cover accuracy of This BNC connector accepts any unknown signal
measurements, random counting procedure, re- from 0.2 to 150 volts rms.
corder operation, and pulse applications, are not
repeated in Section IIC, although they apply equally PULSE
-. well to the 500C. This BNC connector is an output terminal providing
35 volt peak pulse out for special applications (see
SECTION I IB paragraphs 2B-12, 2B-13).
3 500B OPERATING INSTRUCTIONS PHOTOTUBE
2B-1 CONTROLS AND TERMINALS This phone-type jack furnishes bias for a 1P41
SENSITIVITY phototube permitting the direct connection of the
-hp- Model 506A Optical Tachometer.
This control, normally in the maximum position, is
used to decrease the sensitivity of the input am-
plifier to eliminate errors resulting from spurious RECORDER
This phone-type jack is provided for connecting a
modulation of the desired signal. 1 ma recorder to the instrument.
6O'bCHECK
This switch position on the SENSITIVITY control REC ADJ
This screwdriver-operated potentiometer adjusts
places the line frequency into the input circuit. the effective resistance of a recorder to match the
With the RANGE switch in the appropriate position
(usually 100%) and the EXPAND switch OFF, the instrument. The adjustment procedure is described
in paragraph 2B-9.
meter should indicate the frequency of the line
voltage.
2B-2 OPERATING PROCEDURE, COUNTING
RANGE
This rotary switch selects the desired frequency a. Allow a period of five minutesfor the instrument
range. to reach a stable operating temperature after turning
ON.
CAL
The CAL position of the RANGE switch checks b. Turn the SENSITIVITY control to the maximum
satisfactory calibration of the constant current clockwise position. Place the EXPAND switch to
source in the circuit by indicating full scale on OFF.
the 0-10 scale. In this position, input signals
have no effect upon the meter. c. Set the RANGE switch to the 100 KC position.
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ACEC
