Keithley 178 Instruction Manual

INSTRUCTION MANUAL
Digital Multimeter
Model 178
DC VOLTAGE
RANGE
2OV
200 v
1 2 0 0 v
Temperature Coefficient (0°-18° and 28°-55°C):
+(0.006% + 0.2 digit)/°C
Input Resistance: 10
Settling Time:
f i n a l r e a d i n g .
AC VOLTAGE
RANGE
2 v
20 v
200 v
1000 v
Extended Frequency Accuracy:
(45Hz-100Hz) ±(0.5% + 1 5 d i g i t s )
(10kHz-20kHz) ±(1.0% + 1 5 d i g i t s )
Response:
A v e r a g e r e s p o n d i n g c a l i b r a t e d i n r m s
of a sinewave.
Settling Time:
o f f i n a l r e a d i n g .
RESISTANCE
M A X I M U M
RANGE R E A D I N G
20 kQ
200 kQ
2000 kQ
M a x i m u m A l l o w a b l e I n p u t :
Maximum Voltage
5 V o p e n c i r c u i t .
GENERAL
D I S P L A Y :
d e c i m a l p o s i t i o n
CONVERSION PERIOD: 400
ENVIRONMENT:
Operating:
Storage:
AA

SPECIFICATIONS

M A X I M U M
R E A D I N G
1.9999
19.999
199.99
1200.0
M Q ± 0 . 1%
1
s e c o n d t o w i t h i n 1 d i g i t o f
M A X I M U M
R E A D I N G
1.9999
19.999
199.99
1000.0
2 . 5 s e c o n d s t o w i t h i n 1 0 d i g i t s
ACCURACY (12 months) TEMPERATURE COEFFICIENT
18°-28°C
±(% rdg + digits)
1.9999
0.04% +
19.999 0.04% +
199.99 0.04% + I d
1999.9 0.04% + I d
19.999 0.10% + 1 d
250V rms sine, 350Vpeak.
Across Unknown: 2V
F i v e 0 . 5 " L E D d i g i t s , a p p r o p r i a t e
a n d p o l a r i t y i n d i c a t i o n .
milliseconds.
0 ° C to 55°C;
0% to 80% relative humidity up to 40°C.
- 2 5 ° C t o + 6 5 ° C .
ACCURACY (12 months)
18°-28°C
±(% rdg + digits)
1d
0.04% +
0.04% +1Id
0.04% +1Id
0.04% +1Id
Normal Mode Rejection Ratio:
G r e a t e r t h a n 6 0 d B a t 50Hz and 60Hz.
Common Mode Rejection Ratio (lkfi unbalance):
G r e a t e r t h a n 1 2 0 d B a t D C , 50Hz and 60Hz.
ACCURACY (12 months)
(above 2000 counts)
1 8 ° - 2 8 ° C ; 1 00Hz-1 Ok Hz
±(% rdg + digits)
15d
0.4% +
0.3% + 15d
0.3% + 15d
0.3% + 15d
Input Impedance:
Maximum Allowable Input Voltage:
1 0 0 0 V
Common Mode Rejection Ratio (lkfi unbalance):
6 0 d B a t D C , 50Hz a n d 60Hz.
0 ° - 1 8 ° and 2 8 ° - 5 5 ° C
±(% rdg + digits)/°C
0.003% + 0.2d
2d
I d 0.003% + 0.2d
0.003% + 0.2d
0.003% + 0.2d
0.02 % + 0.2d
Settling Time:
within range, r e a d i n g e x c e p t 2 s e c o n d s o n t h e 20Mfi
POWER:
t e d ) , 9 0 - I 10V a v a i l a b l e . 50-60Hz, 7 watts.
O p t i o n a l 6 h o u r b a t t e r y p a c k , M o d e l 1 7 8 8 .
DIMENSIONS, WEIGHT:
w i d e x 2 7 5 m m d e e p (3-1/2 in. x 9-1/4 in. x
10-3/4 i n . ) . N e t w e i g h t : 1.7kg (3lbs., 13 oz).
OVERRANGE INDICATION:
zeros above
MAXIMUM COMMON MODE VOLTAGE:
M A X I M U M
ALLOWABLE
1200V momentary
1 2 0 0 v
1 2 0 0 v
1 2 0 0 v
TEMPERATURE COEFFICIENT
0°-I 8° and 28°-55°C
±(% rdg + digits)/°C
45Hz-10kHz I0kHz-20kHz
0.04% + 0.5d 0.09% + 0.5d
0.01% + 0.5d 0.03% + 0.5d
0.01% + 0.5d 0.03% + 0.5d
0.01% + 0.5d 0.03% + 0.5d
7
r m s , 1 4 0 0 V p e a k , 10 V·Hz
APPLIED
1 s e c o n d t o w i t h i n 1 d i g i t o f f i n a l
1 0 5 - 1 2 5 o r 2 1 0 - 2 5 0 v o l t s ( s w i t c h s e l e c -
85mm high x 235mm
Display blinks all
19999 counts.
INPUT
m a x i m u m .
N O M I N A L
CURRENT
1mA
range.
1400V peak.