Fluke Y5020 Service manual

Instruction Manual

Model Y5020

Current Shunt

®

P/N 516591 September 1979

Y5020

Y5020

INTRODUCTION

The Model Y5020 is a precision, four-terminal, current
shunt designed for use in calibrating ac/dc current sources
in the range of 0 to 20 amps, do to 5 kHz. The shunt is
housed in a forced-air cooled, PTI (Portable Test
Instrument) case. This case is compatible with all
instruments in the Fluke PTI product line and can be
stacked with other PTI products to form a portable test
system.

Forced-air cooling is accomplished by a fan mounted on
the rear panel. Air is pulled in through the fan, passed over
the shunt, and exhausted through the rear panel. Power for
the fan is derived from the power line. Two voltage

configurations are available, 115 or 230V ac ±10%, 50 to
60 Hz.

Four front panel terminals provide electrical access to the
shunt; two are current input terminals and two are voltage
output (sense) terminals. When the shunt is connected into
a circuit and operating at its maximum current limit (20
amps), the input connections and the shunt present a
burden voltage of less than 0.25V dc.

SPECIFICATIONS

Specifications for the Y5020 Current Shunt are given in
Table 1.

1. Locate and pull the black latches on both sides of
the unit to their extended position.

2. Place the unit on top of the PTI stack with the front
panel toward the front of the stack.

3. When the unit is properly seated push both latches
to the in position. This will lock the Y5020 to the
stack.

CONTROLS AND CONNECTORS

The front- and rear-panel controls and connectors on the
Y5020 are shown in Figure 1 and described in Table 2.

OPERATING NOTES
Input Power

Line power requirements for the Y5020 are specified on a
decal located on the bottom side of the unit. These include
line voltage requirements (115V or 230V ac ±10%, 50 to
60 Hz) and replacement fuse types. Input power is used
solely to power an internal cooling fan. A front panel
POWER switch allows the fan to be turned on and off.

Fuse Replacement

The Y5020 includes a fuse to protect the ac power line
from an accidental overload. If replacement is required, use
a 1/8 amp, 250 volt (AGC) fuse. Use the following
procedure to replace the fuse:

INSTALLAT ION

The Y5020 PTI case is designed to stack with other Fluke
instruments in the PTI product line. Use the following
procedure to stack the Y5020 with the other PTI
instruments.

Table 1. Y5020 Specifications

NOMINAL RESISTANCE
ACCURACY OF CALIBRATION VALUE

DC
DC to 1 kHz

1 kHz to 5 kHz
STABILITY OF CALIBRATION VALUE
MAXIMUM CURRENT
BURDEN VOLTAGE AT 20 AMPS
TEMPERATURE COEFFICIENT
POWER COEFFICIENT
POWER

1. Set the POWER switch to OFF and disconnect the

unit from line power.

2. Locate the fuse holder on the rear panel.

0.01Ω ±1%
±.01%
±.01%
±.025%
±.035%
(30 ppm per 6 months)
20A dc or rms ac
Less than 0.25V

≤0.001% per °C
≤0.005% at 20 amps

115V ac ±10% or 230V ac ±10%, 11 watts for cooling fan.

PROTECTION CLASS 3

Relates solely to insulating or grounding properties as
defined in IEC 348.

1

Y5020

12

3

54

6

Figure 1. Controls and Connectors

2