Introduction
1720/1721
1–3
Safety Information
1720/1721 instruments are intended to operate from an ac power source that will
not apply more than 250 V rms between the supply conductors or between either
supply conductor and ground. A protective ground connection by way of the
grounding conductor is essential for safe operation.
The 1720/1721 was tested for compliance in a cabinet. To ensure continued
compliance, the instrument will need to be enclosed in a cabinet that is equiva-
lent to the Factory Upgrade Kits that are listed as Optional Accessories for the
1720/1721. Drawings of the available cabinets are contained in the Installation
Instructions (Section 3).
Specifications
The Performance Requirements listed here apply over an ambient operating
temperature range of 0 to 50° C and are valid only when the instrument is
calibrated at 25° ±5° C, following a minimum warm-up period of 20 minutes.
Procedure and the list of test equipment required to verify Performance
Requirements are located in Section 5.
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