V
OLTECH
AC
I
NTERFACE
U
SER
M
ANUAL
98-072
ISS
7
PAGE
8
1.3. C
HOOSING AN
AC
S
OURCE
To provide system reliability, integration with existing tests and operator safety, the Voltech AC Interface must
be able to control the output of the external AC source that is being used with it.
The AC Interface allows two distinct types of AC sources to be used for testing:
•
A power amplifier or an AC source configured as an Amplifier (analogue control)
•
A voltage or current step-up transformer
A
power amplifier
is an AC source that can be configured so that its AC voltage output is a fixed multiple of a
small AC voltage control input.
The output frequency of a power amplifier is the same as the input frequency of the small AC voltage control.
A power amplifier is Voltech’s preferred choice of an external AC source to be used with the AT3600/AT5600
transformer tester and the AC Interface. Using a power amplifier, the AT3600/AT5600 will:
•
Control the ramp-up and ramp-down of voltage to reduce settling time and optimise test speed.
•
Control the ramp-up of voltage to reduce inrush current.
•
Program any combination of voltage and frequency that the AC source can provide quickly and
accurately. Different voltage / frequency combinations can be used within one program.
•
Accurately trim to the desired output voltage to reduce errors due to the regulation of the source
and the resistance of leads and connections.
Voltech recommends the following AC Sources.
1.
Chroma Model 61600 Series -
A low-cost AC Power Source solution.
•
Voltage range: 0-150V/0-300V/Auto
•
Frequency: 15Hz – 1000Hz
•
Output power from 500VA to 4000VA, depends on model selected.
•
For more details, please visit
http://www.chromausa.com/product/low-power-programmable-ac-
2.
Pacific Power ASX-115T Series
- A commonly available single-phase powered AC source that can provide
132V / 106 at 1500VA.
•
Frequency: 15Hz - 1200Hz Direct, 45Hz – 1200Hz with output transformer
•
It also has a built-in transformer mode, which allows up to 330V.
•
For more details, please visit
http://www.pacificpower.com/English/Products/ASX-Series.aspx
3.
Trek Model 2100HF
– A high-frequency, high speed wide bandwidth amplifier.
•
Voltage range: 0 – 150Vpk, Output Current: 0 – 300mApk
•
Frequency: 0 – 2.6MHz, Slew Rate: 2kV/us typical
•
For more details, please visit
http://www.trekinc.com/products/2100HF.asp
Power Amplifier
(x 50)
AC Power Out
0 - 250V @ 10A
AC Control In
0 - 7.07 Vrms
(+/-10Vpk)
