DATELs new ACA-20PC Series are the first digital ac ammeters to incorporate on board current transformers (CT’s), and they are amazingly easy to use. Simply pass the current-carrying load wire through the ACA-20PC’s on-board CT, apply power to the meters two supply terminals, and you’re instantly measuring ac currents over one of four ranges (0-2A with 1mA resolution, 0-20A with 10mA resolution, or 0-50A and 0-100A with 100mA resolution). Absolutely no external components, such as expensive low-value shunts or 5A "donut" CT’s, are required.
Meters are ac powered (120/220/277Vac @ 50/60Hz or 120Vac @ 400Hz) or dc powered (+5V, +5-40V, or +36-75V) and impose minimal loads (50mA max. and 120mA max., respectively) on their supplies. All models employ auto-zeroing circuits, precision bandgap references, and super stable thin-film resistors for unsurpassed accuracy (±0.15%FS) and stability.

FEATUREs
• Built-in Current Transformers for direct measurement of 0 to 2/20/50/100 Amps
• Functionally complete:
   On-board current transformers
   Scaling/interface circuitry
   Precision A/D converters
   Bright red or green LED displays
• 32 different models
• Subminiature, 1.38" x 0.88" package
• Easy-to-read, 0.37"/9.4mm digits
• AC powered models:
   85-264Vac @ 50/60Hz
   240-310Vac @ 50/60Hz
   85-140Vac @ 400Hz
• "Self-powered" 85-264Vac, 2A and 20A
   models feature built-in load connections
• DC powered models:
   +5V, +5-40V, +36-75V
• 2000V isolation; UL/CSA recognized