TEST ELECTRONICS’ TE-300VAC
Regulated Variable 0-300VAC Power Supply
For convienient desk top and bench top use. Also available in rack mount.

TE-300VAC
Order  # TE-300VAC
The most important features of the power supply is its ability to hold a constant voltage as the power lines fluxuate and the load fluctuates. Used for testing testing high and low line conditions for any AC powered device.

Features

• Digital Voltage metering and a feedback regulated motorized variable transformer.
• Separate course and fine voltage adjustments for presision setting..
• High Voltage and Low Voltage indicator. Changes from green to red over 20VAC.
• High and low rail indicators indicate when power fluctuates and the unit is regulating
• The top of the power doubles as a safe insulated testing area. This innovative design saves bench space, costly safety equipment, and eliminates those dangerous high voltage test leads.

Easily Upgraded for Different Applications
The Tester's internal circuitry consists of a motorized variac followed by a step up transformer. The default internal power supply voltage may be changed simply by swapping the step up transformer and changing the resistors in the feedback control loop.

Front Panel Operation
A: HIGH RAIL INDICATOR
This indicates that the output voltage is higher than the set voltage and the motor is adjusting the voltage down. This indicator may flicker slightly during operation. This is normal, it simply means that the voltage is riding the rail.
B: NON LINEAR REGULATION INDICATOR
When this indicator is on, this indicates that the power supply is in its non-linear regulation mode. When it is off, the power supply is in its linear regulation mode. On, is the normal state for output voltages higher than 50V. This mode allows +/- 1.5% deviation from set voltage before the motor is engaged. Thus, preventing excessive wear from the variac being in constant in motion. Below 50V, the unit is programmed to go into linear mode because the line voltage variation is less significant and will not not cause excessive wear on the parts. This allows the good regulation that is necessary for lower voltages, and prevents excessive wear on the variac for higher voltages.
C: LOW RAIL INDICATOR
This indicates that the output voltage is lower than the set voltage, and the motor is adjusting the voltage up. This indicator may flicker slightly during operation. This is normal, it simply means that the voltage is riding the rail.
D: COURSE VOLTAGE ADJUST
Adjusts the output voltage from 0-300VAC. If the line voltage is low the output voltage may not quite make 300VAC. If this happens Indicator A: HIGH RAIL INDICATOR will remain lit. The output voltage will not be regulated. However, The internal parts are protected and will not be damaged by being left in this mode continuously.
E: SAFETY INTERLOCK MAGNET
This prevents electrical shock hazards by removing the voltage from the output terminals when the cover is lifted. This is verified by indicator F: HV/LV,
F: HV/LV INDICATOR
The color changes to indicate the approximate danger level of the voltage on the output terminals. Used primarily for verifying E: SAFETY INTERLOCK MAGNET is working properly.
G: FINE VOLTAGE ADJUST
Used for adjusting the voltage to the exact level required. First set the voltage level on the meter then, observing the HIGH RAIL LOW RAIL INDICATORS, adjust the voltage so it is centered between the points where these indicators turn on.

Inside View
This view with the side panels removed shows the easy accessibility provided in our test equipment designs.

Safety Features

• Top of the unit doubles as a safe insulated testing area.
• Acrylic cover protects the operator from flying debris.
• Magnetic reed switch safety interlock disables all power to the test terminals when the cover is lifted.
• These safety features make it nearly impossible to touch the HV parts unintentionally. While the unit is in operation.

Electrical Design

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