
VoltageCurrent
Calibrator
Model 828
FEATURES
AC/DC Output
Wide Range  1 Millivolt to 1100 Volts,
1 Microampere to 5 Amperes
High Accuracy
Ease of Operation
High Stability
Direct Reading Percent Deviation of Output Control
High Burden and Compliance Ratings
Short Circuit and Overburden Protection
Continuous Resolution Runup for Analog Meter
Friction Testing
Compact Size for Ease of Portability and Minimum
Bench Space equirements
Rapid Warmup
APPLICATIONS
Calibration of: 
Designed for use in: 


Analog Panel Meters

Production Line Testing 
Portable VoltAmp Multimeters

Laboratory Calibration 
3 1/2 Digit Panel Meters

Field Calibration Service

Transducers

Plant Calibration

Recorders


DESCRIPTION
The Model 828 CurrentVoltage Calibrator
is a compact, selfregulating instrument capable of meeting a high percentage of
calibration requirements for laboratory, production line and field use. A minimum number
of controls assure ease of operation for all grades of personnel. Output voltage and
current are set by fingertip operation of a centrally located digital readout
/selector control. Setting time is less than 1.5 second. Voltage Calibrator output is
covered in four ranges: 1V, 10V, 100V and 1000V with 100% overrange on the three lower
ranges and 10% overrange on the 1000V range. Current Calibrator output is supplied in
five fullscale ranges of 1, 10, 100mA and 1 and 10A. Overrange is 100% on all ranges
except the 10A range where maximum output is 5A.
High burden capability is achieved by a rating of 10VA on the higher
voltage ranges and a rating of 5VA on the one volt range. Compliance of the current ranges
is 5V except for the 10A range where it is 1V.
The percent error of a meter under test may be quickly determined and
directly read by use of the Model 828's Percent Error control. Analog meters may be tested
for "sticky" movements by use of the runup mode which allows voltage or current
to be smoothly and continuously applied to the meter under test.
The calibrator supplies voltage and current at dc and at internally
generated frequencies of 50, 60 and 400 Hz. Low ripple on dc functions and low distortion
in ac modes minimizes random error when calibrating digital and rectifier type
instruments. It is protected against accidental short circuit or overburdening of the
output by internal sense circuitry which removes the output voltage or current if the load
ratings are exceeded.
High output stability makes this instrument suitable for use as a
constant current or constant voltage source.
SPECIFICATIONS
Voltage Calibrator
Full
Scale Ranges: 
Four: 1, 10, 100, and 1000
V. 
Overrange Limits: 
1100 volts on 1000 V range;
200% of fullscale value on all other ranges. 
Stability: 
±0.05%/8 hours; within
rated accuracy for 6 months. 
Voltage Burden: 
5 VA on 1 V range; 10 VA on
all other ranges. 
Current Calibrator
Full Scale Ranges: 
Five: 1, 10, and 100 mA; 1
and 10A 
Overrange Limits: 
5 amps on 10A range; 200%
of fullscale value on all other ranges. 
Compliance: 
1 volt on 10 A range; 5
volts on all other ranges. 
ACCURACY
Output Mode Accuracy
Dc Voltage 
±(0.05% of setting + 0.05%
of range) 
Ac Voltage 
±(0.05% of setting + 0. 1
% of range) 
Current 
±(0. 1 % of setting + 0. 1
% of range) 
GENERAL
Total Harmonic
Distortion 
Less than 0.3% at
fullscale. 
Ripple (Dc Operation
Only) 
Less than 1 % rms at
fullscale with 1 MW load. 
Internal Frequency Source
Frequencies: 
50, 60, and 400 Hz. 
Accuracy: 
50 and 400 Hz: ±l %
60 Hz: ±0.5% 
External Frequency Input
Frequency Limits: 
50 to 440 Hz. 
Input Voltage 
3 volts maximum 
% Deviation Control
Range: 
±2% of setting, adjustable
via front panel control. 
Accuracy: 
±l /2 division (0.05%). 
WarmUp Time 
Less than 3 minutes at room
temperature. 
Operating
Temperature 
+18°C to+28°C (+65°F
to+82°F) for rated accuracy; the Model 828 may be operated from °C to +1 8°C (+32°F to
+65°F) and +28°C and +50°C (+82°F to +122°F) at derated specifications. 
Input Power Requirements
Standard: 
115 V Operation: 104 to 127
volts, 47 to 63 Hz, 45 watts
230 V Operation: 207 to 253 volts, 47 to 63 Hz, 45 watts 
Optional: 
100 V Operation: 90 to 110
volts, 47 to 63 Hz, 45 watts
200 V Operation: 1 80 to 220 volts, 47 to 63 Hz, 45 watts 
Dimensions
Height: 
1 9 cm (71/2 inches) 
Width: 
21.6 cm (81/2 inches) 
Depth: 
33 cm (13 inches) 
