INSTRUMENT OPERATION
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Chapter 6
Glass Dimensions
Use the HL-U for pipettes with outside diameter (OD) of 1.0-1.7 mm. The optimal
dimensions should match the inner diameter (ID) of the four sizes of cone washers, 1.1, 1.3,
1.5 and 1.7 mm. When the pipette OD falls between two sizes of cone washers, the larger
size cone washer should be used. For instance, if the pipette OD is 1.6 mm, then use a cone
washer with an ID of 1.7 mm.
Adapters
HLR-U right-angle adapters allow the HL-U series holder to emerge at 90° from the
headstage. Use the HLR-U with the HL-U holder.
HLB-U BNC-to-Axon adapter allows conventional BNC-type holders to be used with Axon
Instruments U-type headstages. Use the HLB-U with all U-type CV and HS headstages
(e.g., CV-4-1/100U and HS-2A-x1MGU). These headstages have a threaded white Teflon
collet.
Input BNCs
BLANK ACTIVATE INPUT
A positive TTL pulse delivered to this input causes the output current to be held at the
value it had at the instant the pulse was activated and to hold it at this level for the duration
of the pulse. This is useful, for example, to blank the capacitance transient associated with
the leading edge of a voltage step.
CAPACITANCE DITHER CONTROL
Provides control for the internal capacitance dithering used in capacitance measurement
experiments. A TTL HIGH signal enables the dither, which effectively causes a change of
0.1 pF (for β = 1; 1 pF for β = 0.1) in C
m
.
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