HP 740B Operating And Service Manual page 7

Section I
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Model 740B
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Figure 1-1. Model 740B DC Standard/Differential Voltmeter
Table 1-1. Specifications
DC STANDARD
RANGES:
Output Voltage: 0 to 1000* volts in 4 decade ranges
with outputs as follows:
o
to 1. 000000 volts in 1 jJ. V steps
o
to 10.00000 volts in 10 jJ.V steps
o
to 100.0000 volts in 100 jJ.V steps
o
to 1000. 000 volts in 1 m V steps
PERFORMANCE RATING:
Accuracy: ± (0.002% of setting + O. 0004% of range)
at 23
0
C±1 0 C, lessthan 70%relative humidity,
constant load.
Stability: Rated accuracy is met after 1 hour
warm -up period, with a 30 -day calibration
cycle.
Short Term: 1 ppm of setting + 0.5 ppm of
range/hour; 5 ppm of setting + 1 ppm of range/
day.
«
100 volts output.)
Temp. Coefficient: Less than (2 ppm of setting
or 1 ppm of range whichever is greater) per
°C; 100C to 40 0 C.
OUTPUT CHARACTERISTICS:
Output Current: Current limiter continuously
adjustable 5-50 rnA nominal. Max. output cur-
rent, 50 rnA decreasing linearly to 20 rnA at
1000 volts output.
Output Resistance: Less than (0.0002
+
0.0001
Eo) ohms at DC.
Load Regulation: Less than (0.0005% + 10 jJ.V)
change, no load to full load.
Line Regulation: Less than ± (0.0005% of setting
+
O.
OOOl%of range) for 10% line voltage change.
Noise and Hum: .01 to 1 Hz: less than 1 ppm of
range;
1
Hz to 1 MHz: 100 dB below full scale
or 100 jJ.V rms, whichever is greater.
1-0
Output Terminals: Plus and minus output, plus
and minus sense, circuit guard, and chassis
ground. Banana jacks mounted on remote
terminal box (Accessory 1l055B, furnished).
Output and sense terminals are solid copper,
gold flashed. Amaximum of 500 Vdc may be
applied between chassis ground and guard
or circuit ground.
Zero Control Limits: ±O. 001% of range nom-
inal.
Readout: 5 digital display tubes indicate first
5 digits; meter displays 6th digit.
DC DIFFERENTIAL VOLTMETER
Voltage Ranges: 1 mV to 1000 v* DC in 7 de-
cade ranges.
Resolution: Null ranges give full scale indi-
cation of ±O. 01% of range. Max. resolution
1 ppm at full scale. Max. usable null sensi-
tivity: 1 jJ.V full scale.
PERFORMANCE RATING:
Accuracy: ± (0.005% of reading
+
0.0004% of
range + 1
I).V)
at 23 0 C ± 1°C, less than 70%
relative hum idity.
Stability: Rated accuracy is met after a 1 hour
warm -up period, with a 30-day calibration
cycle.
Short-term: 1 ppm/hr., 5 ppm/day exclu-
sive of zero drift. (--- 100 volts input. )
Zero stability: (1 ppm of range
+
2
Il.
V)/day.
Temp. Coefficient: Less than ± (2 ppm of read-
ing
+
1
I).
V)/ 0C, 10°C to 40°C.
Line Regulation: Less than ±(O. 001%ofreading
+
2
flV)
change for 10% line voltage change.
01794-1