The leading supplier of cutting edge technology

SIM928 Isolated Voltage Source

SIM928 Isolated Voltage Source
  • ±20 V isolated voltage source
  • Ultra-low noise output
  • Two switchable, recharging batteries for continuous operation
  • Battery lifetime: 1000 charge cycles
  • Output floats to ±40 V
  • Short-circuit protected

The SIM928 Isolated Voltage Source is ideal for applications where ultra-clean DC voltage is required. Voltage can be set between ±20 VDC with millivolt resolution, and the source can drive up to ±10 mA.

SIM928 specifications

The output circuit is optically isolated from all earth-referenced charging circuitry, providing maximum flexibility and noise immunity. The system can float to ±40 V, and the output is short-circuit protected.

At the heart of the SIM928 are two independent nickel-metal-hydride rechargeable batteries, each providing up to 12 hours of operation under full load conditions. When a battery is nearly depleted, the SIM928 automatically switches in a second battery. The switchover between batteries is virtually glitch-free, giving you uninterrupted power around the clock. The depleted battery is automatically charged to capacity in about 5 hours. The batteries are guaranteed for 1000 charging cycles, and SRS offers replacement battery sets.

In applications that occur over long time intervals, starting with a fully charged battery may be desirable. A battery charge override feature allows you to manually switch in the fully charged battery (assuming it is in “ready” state) at any time.

Banana binding posts are provided for the + terminal, - terminal and chassis ground.

Specifications

Output  
Output range ±20 V, 1 mV resolution
Max. output current ±10 mA
 
Floating output ±40 V (common mode to ground)
Noise 10 µVrms (1 kHz bandwidth)
Current limit 15 mA
Short-circuit duration indefinite
 
   
Batteries  
Number of batteries 2 (1 operating, 1 charging/standby)
 
Type Nickel metal hydride
Charge time 5 hrs
Discharge time 12 hrs. (10 mA load)
Lifetime >1000 charge cycles, 2 yr. shelf life
Battery switching Automatically switches batteries when active battery is fully discharged.
Switchover glitch <1 mV for <1 ms
 
Battery charge override
 		 Allows manual switching of batteries. Triggered when front-panel button is held for 5 seconds or more. Only armed when standby battery is in ready state.
   
General  
Operating temperature 0 °C to 40 °C, non-condensing
 
Interface Serial via SIM interface
Connectors
 		 Banana binding posts (+ terminal, - terminal, and chassis ground) DB15 (male) SIM interface
Power
 		 Power supplied by the SIM900 Mainframe, or optionally by a user-provided DC power supply (-15 V, +24 V and +5 V)
Dimensions 1.5" × 3.6" × 7.0" (WHL)
Weight 3 lbs
Warranty One year parts and labor on defects in materials and workmanship