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AMETEK SLM Series Rev B User Manual

Page 32

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Operation

SLM-Series AC/DC Electronic Load

3-6

M540072-01 Rev B

Power:

Press the LIMIT key until the LIMIT LED is on and the “W” LED (5) is lit. The
upper DM displays the upper power limit; the lower DM displays the lower power
limit. Use the coarse  keys to set the upper limit and the fine

↑↓ keys to set

the lower limit.

VA:

Press the LIMIT key until the LIMIT LED is on and the “VA” LED (5) is lit. The
upper DM displays the upper VA limit; the lower DM displays the lower VA limit.
Use the coarse

to set the upper limit and the fine

↑↓ keys to set the lower

limit.


Vsense Input: The “SENSE” key toggles external Vsense on (LED lit) and off (LED
not lit).

3.2.2 Frequency

Setting:

The range for setting the frequency of SLM-Series AC/DC electronic Load module is
from DC-70Hz. Specifications apply 40-70Hz.

1. Press the FREQ key (15) until its LED lights and “FrEq” appears on the upper

DM.

2. Use the coarse/fine

/

↑↓ keys to set the frequency to the desired value, to DC

or to Auto.
• If the frequency setting is less than 0.1 Hz, the frequency setting value will

set automatically to DC.

• In Auto, the load automatically synchronizes to the zero crossing of the

voltage input at the terminals.

• After setting the frequency, set the SYNC trigger to OFF to make the

frequency valid.

3.2.3

Current Synchronization

External SYNC Signal (SYNC ON)

• The user can input a SYNC signal to the Analog Programming Input BNC

connector on the back plate.

• Based on this external SYNC signal, the SLM-Series AC/DC Electronic Load,

the phase of load current will synchronize to the zero crossing of the external
signal.

• The external SYNC signal must be a 50% duty cycle.

1. Press the “FREQ” key until “Sync” appears on the upper DM.
2. Press any

↑↓ key to toggle the external sync on and off.

Internal SYNC signal (SYNC OFF)

• The internal SYNC signal source of SLM-Series AC/DC electronic load is

taken from the voltage signal at the terminal inputs.

• The load current signal will synchronize to the voltage zero crossing of the

input terminals.