AMETEK SLM Series Rev B - Manual (Page 32)

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.