BAT-Low battery indicator for the Model 1978.
AC-AC selected (DC implied by the absence of the AC an-
nunciator).
mV
or
V-Millivolts or volts.
O,
kO or MO-Ohms, kilohms
or
megohms.
p,
mA or A-Microamps, milliamps
or
amps.
RMT
(REMOTE)-Model 197 being controlled over the
IEEE-488 bus (Model 1973
or
Model 1972 installed).
C-Model 197 in calibration mode.
AUTO-Autorange.
REL-Relative.
dB-Decibel measurement mode.
STO-Data being stored.
RCL-Data being recalled. RCL flashes when buffer is full
during logging cycle.
2.4.2 Front Panel Controls
ON/OFF-Pressing this button turns on the Model 197.
Releasing (out) this button turns the instrument off.
REL-(RELATIVE)-This button allows readings to be made
with respect to any baseline value. Also allows zeroing
of
on
range readings. See paragraph 2.7.2 for more detailed infor-
mation on
REL.
dB-This button selects the dB function and is used along
with the ACV or DCV function. Measurements are made in
dBm referenced to
600O.
REL
can be used to make any
voltage level the OdB reference point for dB measurements.
DATA LOGGER and MIN/MAX-100 reading storage
capacity; records data at one
of
seven selectable rates from
3
reading/second
to
1
reading/hour
or
by manual trigger
(r=6).
Also detects and stores maximum and minimum
readings continuously while in the data logger mode.
1.
STO/CLR-Pressing this button initiates the logging se-
quence. Pressing this button
a
second time turns off the
data logger. For
r=6
rate (manual trigger) every time a
reading is desired, press the STO/CLR button.
2. RCL-Pressing and holding in this button scrolls the data
pointer. To read the data at a certain point, simply release
the button. The logged readings are stored in buffer loca-
tions
01
to 102. They are depicted on the front panel as
follows: Buffer location
#1
is represented
___
by n=01.
-
-
AC/DC-This button is used along with the volts
(V),
cur-
rent
(A),
and dB functions. Depressing (in) this button selects
AC, releasing (out) this button selects
DC.
AC
!2
is invalid
condition. See Table 2-1.
V-Depressing this button selects the volts function.
0-Depressing this button selects the ohms function. The
AC/DC button must be released (out).
A-Depressing (in) this button selects the current function.
Up to 2A on red and black input jacks and up to 10A with the
black and white input jacks. Refer to paragraph 2.4.3.
RANGE BUTTONS
1.
Depressing AUTO button allows volts and ohms to
autorange. In current,
it
selects the 10A range. There is no
autorange function for current.
2.
Manual ranging
is
accomplished by depressing the ap-
propriate range button.
2.4.3 Input Terminals
The input terminals are intended to be used with safety
shrouded test leads to help minimize the possibility
of
contact
with live circuits. Safety shrouded tests leads (Model
1751)
are supplied with the Model 197. Always disconnect all un-
used test leads
from
the instrument.
HI
and
LO
INPUT (Red and Black)-Use this pair of ter-
minals
for
all volt, ohm, milliamp and dB measurements.
1OA
and
LO
(White and Black)-Use this pair of terminals for
measuring current up to 10A (up to 20A
for
15 seconds).
OHMS Sense HI and LO-Use this pair of terminals along
with HI and
LO
input for four wire resistance measurements.
2.4.4 Current Fuse Replacement
Tne current fuse protects the 200pA through 2000mA ranges
from an input current greater than 2A. To replace the current
fuse, perform the following steps:
NOTE
The front panel current fuse (F101) is rated at
2A. With a 220,000 count display, the 2A range
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