技术指标：
1、 检定电子秒表和机械秒表：
在1－99999秒内可任意置数
准确度±（2＊10－7＊输出时段）秒±0.003秒
2、 检定电子毫秒仪（正负两组输出）
在1－99999秒内可任意置数，**小输出100微秒
准确度±（2＊10－7＊输出时段）秒±0.003秒
3、 检定电秒表（适合新规程JJG237-95）
在1－99999秒内可 任意置数
指针式准确度：电同步＜±0.6毫秒
数字式准确度：±（2＊10－7＊输出时段）秒±0.006秒

Introduction

The calibrator is a precision instrument calibrating mechanical stopwatch, electronic stopwatch, and 405/407/408/415/417 type pointer electric stopwatch. The SF2001 stopwatch calibrator is compliant with the stopwatch calibration procedure JJG 237-2010 issued by the National Metrological Bureau. It could be used at metrological department at all levels, factory, institutions and all research institutes to calibrate electric stopwatch (405,407,408,415/417), mechanical stopwatch and digital quartz electronic stopwatch. The instrument is fully digitally controlled, high reliability,high accuracy, complete functions, convenient operation, and strong anti-interfere
ability.
GDS-50 stopwatch calibrator and its accessories:
1)GDS-50 stopwatch calibrator       1 piece
2) Three-core power cord               1 piece
3) Dual banana plug test lead         2 pieces
4) BNC-banana test lead                 1 piece
5) Soft copy of User’s Guide            1 piece

1.1 Crystal Oscillator
Nominal frequency: 5MHz
Daily aging rate: ≤5×10 -9 /day
Second stability: ≤5×10 -10 /s
Accuracy: ≤1×10 -7
Warming-up time: over 2 hours
1.2 Calibrate mechanical stopwatch and electronic stopwatch (T0 is inputted calibration period of time)
Input range: T 0 :1s-99999s
Accuracy: better than ±(1×10 -7 ×T 0 +3ms)
1.3 Calibrate electric stopwatch
Pointer:
Input range:
Continuous: T 0 :0.1s-99999s
Trigger state: T 0 :1s-99999s
Pause state: T 0 :0.1s-99999s
Accuracy: better than ±(commercial power frequency accuracy×T 0 +0.6ms)
1.4 Calibrate millisecond counter and digital electric stopwatch
Input range: T 0 :1×10 2 µs-1×10 9 µs
Accuracy: better than ±(1×10 -7 ×T 0 +3µs)
The SF2001 calibrator is fully compliant with the mechanical stopwatch and digital quartz stopwatch calibration procedure, electric stopwatch calibration procedure, and electronic millisecond counter calibration procedure, issued by the National Metrological Bureau.

2.1 Working conditions
Voltage: 220(1±10%)V;
Frequency: 50(1±5%)Hz;
Power consumption: <60VA;
Temperature : 0~40℃;
Humidity: <80%
2.2 Mechanical characteristics
Dimension: 329mm×283mm×155mm Weight: 3.7kg
2.3 Operation characteristics: Input with keys, menu display
2.4 Display mode: LCD display,English menu
2.5 Technique: With SMT technique and large-scale IC, the calibrator is of high reliability, small volume and long service life.