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The HF2CA tab provides remote control over the HF2CA Current Amplifier which is available as an accessory to the HF2LI Lock-in amplifier. The HF2CA tab dynamically adapts its content depending on whether or not a HF2CA is connected to one of the ZCtrl connectors of the HF2LI.


  • Input impedance range from 10 V/A to 1 M V/A (R1, R2)
  • Input mode differential or single-ended (Diff, Single)
  • Input signal coupling mode (AC, DC)
  • Output stage gain (G=1 or G=10)


The HF2CA tab contains an interactive circuit diagram allowing the user to control the input settings, grounding, and gain of the preamplifier. Whenever the tab is closed or an additional one of the same type is needed, clicking the following icon will open a new instance of the tab.

Table 1: App Icon and short description
Control/Tool Option/Range Description
HF2CA Remote control of the HF2CA Current Amplifier.

The HF2CA tab consists of two side-tabs corresponding to the two ZCtrl inputs of the HF2 instrument. Each side-tab is horizontally divided into two identical sections corresponding to the two Signal Inputs of the HF2CA as shown in Figure 1.

Figure 1: HF2CA tab

Additional HF2CA specification can be found in the HF2CA Current Amplifier Data Sheet.

Functional Elements

Table 2: HF2CA tab
Control/Tool Option/Range Description
Single ON / OFF Switch between differential and single-ended input configurations
R (Ω) 10, 100, 1k, 10k, 100k, 1M, Inf Select input impedance
DC ON / OFF Switch between DC and AC coupling after the first amplification stage
G1 / G2 1, 10 Set the voltage gain of the second amplification stage