Dal manuale originale :

The HP 4261A is a 3-1/2 digit LCR meter that does te rest-automatically selecting the proper measuring range and equivalent circuit mode.

Accuracy applies over a temperature range of 23°C ± 5°C (at 0° to 55°C, error doubles).

• Test Frequency 120 (100) Hz, 1 kHz ± 3%
•  Signal Level (Typical) 1 V, 50 mV (Cp mode only)
• Parameters Measured L-D, C-D   R
• BCD Output optional 
• Display 3-1/2 digits  max. display 1900
• Basic Accuracy 0.2%
•  DC Bias Int. 1.5 V, 2.2 V, 6 V ± 5%, selectable
               Ext. 0 to +30 V 
• Equivalent Circuit Modes auto, parallel, series
• Ranging Modes LCR: auto, manual    DQ: D only-fixed
• Trigger  internal, external, manual
• Measuring Terminal 5-terminal configuration
• Measuring Time (typical) for a 1000 count measurement on a low Loss component on a fixed range:
  1 kHz, 10 kHz: C/L 220-260 ms, R 120-160 ms
   120 (100) Hz: C/L 900 ms, R 700 ms
• Ranging Time 1 kHz, 10 kHz: 180 ms/range step
   120 (100) Hz: 670 ms/range step
• Reading Rate INT (internal trigger) approximately 30 ms between end of measurement cycle is initiated by a remote trigger input.
• Dimensions : 213 x 134 x 422 mm
• Weight : 7,5 kg  16 lb 8.3 oz

• 16061A: test fixture, direct couple, 5-terminal 
• 16062A: test leads with alligator clips, 4-terminal (for low impedance measurements)
• 16063A: test leads with alligator clips, 3-terminal (for high impedance measurements)